In 1993 Harry Bosch was assigned the case of a missing person Marie Gesto. The young woman was never found
- dead or alive
- & the case has haunted Bosch ever since. Thirteen years later Bosch is in the Open-Unsolved Unit when he gets a call from the DA's office. A man accused of two killings is willing to confess to several other murders in a deal to avoid the death penalty. One of his victims he says is Marie Gesto. Bosch begins to crack when he realises that he & his partner missed a clue back in 1993 which could have prevented the nine murders that followed the killing of Marie Gesto...