In a deadly game of cat and mouse, Detective Erika Foster confronts her greatest nemesis—where the lines of justice blur and secrets unravel.

A collapsed ceiling. A dead body. What starts as a routine 999 call takes an unexpected twist when Erika Foster arrives on the scene and discovers the body of a woman in an empty flat, with all DNA evidence scrubbed away. When forensics find cocaine residue coating every surface of the ceiling, Erika calls in the drug dogs, who lead her to a mysterious parcel locker on the outside wall of the property. Chasing down the locker’s owner leads Erika back where she never expected to be–staring into the eyes of Jerome Goodman, the drug dealer who murdered her husband, Mark, ten years ago.

She arrests him on the spot, but there’s just one problem. His passport and his solicitor say his name is Kieron Bagshaw, and his record is squeaky clean.

With top brass demanding she take leave to deal with her PTSD and even her closest colleagues questioning her sanity, Erika decides to use the time off to do some digging of her own. Trawling for clues through old newspapers, encrypted messages, and secret underground passageways, Erika makes a series of shocking discoveries that move Mark’s murder from cold case to active investigation, all while flying under the Met’s radar.

The revelations will push Erika to the brink, forcing her to confront the trauma of her past and the truth about what happened the day Mark died–and who among her friends was involved from the shadows.