Lost Light is the ninth novel in Michael Connelly's Harry Bosch series.

[1] Lost Light is the first novel set after Bosch retires from the LAPD at the end of the prior story.

The case leads him back into contact with his ex-wife Eleanor Wish, who is now a professional poker player in Las Vegas, and Bosch learns at the end that he and Eleanor have a young daughter.

The poem referenced in this work is from Ezra Pound's "Exile's Letter:" What is the use of talking, and there is no end of talking, There is no end of things in the heart.

Lost Light is distinguished by the inclusion of a soundtrack CD, "Dark Sacred Night, the Music of Harry Bosch", to accompany the first hardback edition,[citation needed] featuring jazz music that Harry Bosch would have been listening to,[2] including music of Art Pepper, Sonny Rollins and John Coltrane.