Echo Park by Michael Connelly

In 1993 Marie Gesto disappeared after walking out of a supermarket. Harry Bosch worked the case but couldn't crack it, and the twenty-two-year-old was never found. Now, more than a decade later, with the Gesto file still on his desk, Bosch gets a call from the District Attorney.A man accused of two heinous murders is willing to come clean about several others, including the killing of Marie Gesto. Taking the confession of the man he has sought-and hated-for thirteen years is bad enough. Discovering that he missed a clue back in 1993 that could have stopped nine other murders may just be the straw that breaks Harry Bosch.