[2] The player takes control of homicide detective Becky Marney (Katie Cassidy) and district attorney Felicity Graves (Christy Choi/Ashley Voom),[a] both of whom are involved in the case of a serial killer known as The Trapper.

[3] The game features quick time events that determine the outcome of the story, including a character's death or survival.

With the PlayLink feature, others may join the game to vote for a specific decision to be made, using their Android or iOS smartphones.

[2][4][5] The game opens on an event that occurs six weeks before the playable prologue; Father Rominski is seen sitting in a prayer position with a bomb attached to him.

In November 2012, Third Precinct detective Becky Marney and her partner Tom Nelson (Leonard Roberts/Michael Addo)[b] arrive at the scene of a possible hostage situation by a serial killer known as the Trapper.

Finn confesses to the Trapper crimes and is sentenced to death by lethal injection by Judge William Vanstone (Robert Lewis Merrill/Simon Bond)[e] despite the recommendation of district attorney Felicity Graves.

If Tom died or was promoted to sergeant, Becky is assigned a new partner, Karl Carter (West Liang/Jozef Aoki).

[f] In 2017, Sergeant Noah Riggs (Chris L. McKenna/Jack Green)[g] is briefing Becky, her partner, and detective Jack Calvary (Chad Michael Collins/Dawid Kocieda)[h] on more unsolved murder victims.

Finn claims to Felicity that he falsely confessed to being the Trapper, and that the real killer is Adam Jones, his old friend from Las Palmas Orphanage.

She is told by medical examiner Simon Hillary (Gabriel Schwalenstocker/Leonardo Patane)[i] that there was no reason to suspect another killer besides Finn.

They note the victims were all connected to the Las Palmas Orphanage: alcoholic undertaker Rupert Walsh, orderly Frederick LeMay, social worker Catherine Hope, and Father Rominski.

It can also be discovered that Jones was orphaned because his mother shot his father to death after suffering repeated physical abuse.

There are a number of endings: If Becky was framed as the Trapper, a post-credits scene shows Hillary buying more mouse traps.