Call of Cthulhu is a role-playing survival horror video game developed by Cyanide and published by Focus Home Interactive for the Nintendo Switch. The game features a semi-open world environment and incorporates themes of Lovecraftian and psychological horror into a story which includes elements of investigation and stealth. It is inspired by H. P. Lovecraft's short story "The Call of Cthulhu", while also being an adaptation of the 1981 role-playing game of the same title.
In 1924 Boston, Private investigator and war veteran Edward Pierce suffers from increasingly bizarre nightmares, and self-medicates with sleeping pills and alcohol. He is soon contacted to look into the case of the Hawkins family, who mysteriously died in a fire. As the only clue is a strange picture painted by the supposedly crazy mother shortly before her death, Edward has to set out to Darkwater Island off the coast to find out more about the matter.
Upon arriving in Darkwater, Pierce is steeped in the strange local culture. Darkwater was home to a booming whaling industry until a sudden scarcity in 1847. That year, the island's last ship, the Scylla, returned with a legendary "Miraculous Catch," that saved the island. The islanders are superstitious and suspicious of outsiders like Pierce. The detective meets Captain Fitzroy, who provides him with a few details of the Hawkins family; Officer Bradley, who handled the case; and Cat Baker, a successful bootlegger and feared gang leader. He also sees a beached killer whale, killed by ghastly wounds, being dragged back into the sea by the police, much to the locals' chagrin.
While exploring the Hawkins' mansion with Bradley, Pierce learns more about the Hawkins family. The wife, Sarah, was a famous painter known for her macabre style, but also rumoured to have been mentally unstable. Pierce determines that the fire may not have been an accident, and furthermore, someone may have survived. Shortly after, he is accosted by a robed man who is stealing something from the attic. Pierce and Bradley give chase and soon discover a hidden door that leads to secret caves and tunnels beneath the island. There, they discover the thief and other cultists performing a ritual. Bradley recognizes the leader as Charles Hawkins, thought dead in the fire. Hawkins is horrifically mutated now, and kills Bradley with a tentacled arm. Pierce barely escapes, but passes out when he is trapped in the collapsing cave.
He awakes in a mental institution in the basement of the Riverside Institute, under the care of Dr. Fuller. He is drugged and suffers more nightmares and hallucinations, including visits from an otherworldly voice that seems to be directing certain events. Eventually, he escapes with the help of Dr. Marie Colden. Along the way he discovers evidence of strange experiments by Fuller. He also encounters Francis Sanders, who had been given a painting by Sarah. Francis is another patient/prisoner of Fuller, and after speaking to Pierce about "The Shambler," he is brutally killed by an unseen force. Once back at the Hawkins mansion, Pierce, Colden, and a suddenly alive Bradley (who has a broken recollection of his supposed death), decide to visit the widowed Mrs. Sanders, and learn more about Francis and The Shambler. At the Sanders house, he also finds Cat once more, there to help the widow sell her late husband's art collection.
The Shambler was a painting by Sarah that she gave to Francis after much resistance. Pierce examines the painting, which comes to life and pits him against the physical manifestation of the creature. He manages to banish it by slashing the painting with a ritualistic dagger from the Sanders art gallery.
His investigation then leads him to a bookstore owned by Algernon Drake, a friend of Sarah Hawkins, where he discovers the Necronomicon in a safe. Upon reading the book, he has an out of body experience that places him into the mind of Marie Colden, seeing events at the Institute through her eyes. After discovering numerous patients exhibiting signs of mutation, Colden confronts Fuller about his experiments and is knocked out. Upon returning to his body, Pierce is confronted by Drake, and the two form a shaky alliance.
Pierce rushes to the Institute to save Colden, but after suffering more hallucinations and taunting by the voice in his head, finds her dead at Fuller's hands. Exploring further, he discovers Sarah Hawkins, imprisoned but alive. The two run, but are stopped by the monstrous Charles Hawkins, who claims he was trying to protect Sarah from the cult due to her gifts as an "Oracle." Pierce and Sarah defeat and kill Charles, before escaping back to the mansion.
There, Pierce finds an amulet Charles had hidden, which Drake says can protect Sarah from the cult's influence. Exiting the house, Pierce is arrested by Darkwater police after being identified as the perpetrator of the Hawkins fire. While at the jail, he is visited by a gostly figure, who identified itself as "Leviathan." It speaks to Pierce about destiny, and offers him a gift in the form of knowledge. Pierce once again leaves his body and experiences events through Sarah's eyes as she and Drake perform a ritual to banish the Shambler for good (Drake can die here, depending on the player's actions). Pierce, once again in his cell, is visited by the Leviathan again, and shown visions of his companions. Bradley doubts himself and their fight against the cult. Cat is shown shooting and killing Pierce, and Sarah is shown painting a portrait of him. He then leaves his body again, and sees Cat at her gang's warehouse examining a dead policeman left there. The gang is then attacked by the local fisherman, seemingly bewitched by the Leviathan's influence.
Pierce is released from his cell by Bradley, who is also succumbing to the madness. Pierce takes his gun and fights his way to the whaling station, where Sarah was seen heading. There, he discovers the secret of the island's dark history. The "Miraculous Catch" of 1847 was the Leviathan. The crew of the Scylla captured the enormous creature, and were driven mad by its influence, with some of them, namely Fitzroy, Fuller, and Charles Hawkins; eating its flesh and gaining immortality. The Leviathan it seems wanted to be caught, to direct the events that followed through its mental influence, including Pierce's arrival to the island, and his actions here in the whaling station. While trapped in a hallucination, Pierce causes an explosion that destroys the whaling station, freeing the Leviathan. The cult, led by Fitzroy, try to apprehend Pierce, but he falls into the water, encountering the Leviathan one last time before it swims away back to the depths of the sea.
Pierce washes up near a coastal cave and makes his way through the tunnels toward Alabaster Point. Along the way he encounters visions of Marie Colden, Dr. Fuller, and Charles Hawkins. He finally arrives at the cult's meeting place, where a strange storm is brewing over the ocean. Sarah, a fully willing cultist now, explains his destiny to Pierce, and he is given the choice to give in to the madness and help perform the cult's ritual or not. Depending on choices made throughout the game: dialogue, exploration, and events that affect Pierce's sanity, there are four possible endings:
If Pierce's sanity is intact, he can refuse to take part in the ritual. Sarah Hawkins, not able to fight Pierce's free will, kills herself. Later, Pierce is seen back at his office in Boston, drunk and depressed, traumatized by the events.
If Pierce's sanity is broken, he can choose to shoot himself, ruining the cult's chances of performing their ritual. Later, his office in Boston is seen being cleared out, but a painting of his suicide is seen in the room.
If Drake survived his battle with the Shambler, Pierce can have him perform a counter-ritual. The storm and the cult disappear. Later, Pierce is seen in a mental institution, insane and being treated with sleeping pills.
Lastly, you always have the option of having Pierce give in and perform the ritual. His blood is spilled by the ritualistic dagger, and the storm grows, summoning the Great Old One Cthulhu. The arrival of the entity causes those present to go mad, fighting and killing each other. Pierce surveys the violence before joining in, killing Fitzroy in a mad frenzy.