A serial murderer stalks the affluent suburbs of North London. The victims are found drained of blood, surrounded by bizarre arrangements of small animal bones.

For seven years, DCI Oswald Lennox has chased a ghost, his once razor-sharp instincts dulled by insomnia and memory lapses. The killer is getting bolder, and Lennox is starting to fear that the biggest clue might be the one he’s already forgotten.

PC Olivia Blackwood’s ADHD makes her unpredictable but brilliant—when she’s focused. Assigned to shadow Lennox, she’s the last person he wants on the case, and she knows it. But as they close in on the killer, a buried secret binds them in ways neither expected—just as the murderer sets their sights on a final, devastating strike.