Six months after Anna Sheridan's disappearance, detective Sam Bailey is assigned to her case. As he listens to the first of many tapes left by the author, he relives her encounter with an entity in the ruins of the Santa Lucia mine.
The investigation continues as Sam Bailey listens to Anna's encounter with a supernatural presence in "The Mirror House" the supposedly haunted home of a silversmith obsessed with the infinite.
Suffering from an acute case of writers block, Anna Sheridan retreats to a small cabin on the Oregon coast to work on her latest novel - but despite her best efforts to avoid them, supernatural forces reappear at nightfall.
As she investigates a potentially haunted waxworks museum, Anna Sheridan recounts the encounter of her friend Giles Fallow with a mysterious creature during the Yom Kippur War.
Crossing the Donner Pass, Anna Sheridan finds herself stranded when a sudden snowstorm blows in. Recounting the story of the Donner Party's tragic passage, she begins to wonder if she's really alone.
Searching for information about Anna Sheridan's disappearance, detective Sam Bailey interviews Doctor Ren Park about his friendship with the infamous writer, and the impossible encounter in the labs of Quentin Aerospace that followed.
Driving across the Klamath-Siskiyou forests late at night, Anna Sheridan encounters a supernatural hunting party and finds herself part of a chase that has gone on for hundreds of thousands of years.
Anna Sheridan recounts her childhood friendship with a girl named Amy Sterling, and returns to the memory of a late afternoon in May, when that girl began disappearing out of the world.
Pursuing an evil she inadvertently released into the world, Anna Sheridan travels to the National Radio Quiet Zone with Kate, trying to reconcile with her sister while struggling with her own guilt.
As the investigation continues, Sam Bailey pursues an unknown figure across Oslow County, only to discover that they might hold a vital clue to Sheridan's fate.
While on tour in London, England, Anna Sheridan encounters an impossible, twisted realm within the Royal Albert Hall during one of the few concerts she's ever attended.
Hiking the PCT with Maria Sol, Anna Sheridan takes a detour to visit Lake Tahoe and investigate the supposed haunting of Fannette Island by one Captain Dick Barter.
Following up on a lead from the previous tape, detective Sam Bailey interviews Maria Sol about her relationship with the infamous Anna Sheridan and the strange events that followed.
At an abandoned Girl Scout camp in New York, Anna Sheridan hunts a creature she encountered early in her career - a creature she believed to be dead nearly twelve years ago.
Roaming the abandoned streets of a newly-made ghost town, Anna Sheridan reflects on the relationship between place and person, past and present, and the resilience - and futility - of the human spirit.
With the investigation into Anna Sheridan's disappearance seemingly at an end, Bill Tyler and the rest of the Oslow County Police Department celebrate Sam's success at Marvin's Bar and Grill - But doubts still linger in his mind.
Following a stunning revelation in the Sheridan case, Sam Bailey and Maria Sol plan their next steps as they form an uneasy alliance, and investigate Anna's long history with doppelgängers, duplicates, and deception.
On her way to Chile to investigate a potential sea monster, Anna finds herself stuck in Kingstown when hurricane Sandy makes landfall. A strange, unseen presence begins to make itself known.
Waiting for Sam to return to his office, Maria Sol discovers an unexpected cassette hidden amongst Anna Sheridan's tapes: One that holds many answers, but even more questions.
A series of short recordings from across the continental US, as an unnatural thunderstorm rolls across the country and the stresses of Anna's disappearance begin to press down on those involved in the investigation.
Pushed to the point of desperation, Sam Bailey and Maria Sol prepare to arrest the false Anna at the halfway house. But things are not as they seem as the investigation takes another dark twist.
Following his arrest of the entity calling itself Anna Sheridan, Sam Bailey attempts to hold her in the Oslow County Police Headquarters, but not everyone is convinced that she is who he claims.
At a roadside campsite in the middle of a storm, Anna Sheridan wakes from a nightmare to realize that a part of her past has been stolen and hidden away from her - until now.
