Cielo Azul by Michael Connelly is a short story featuring Harry Bosch and Terry McCaleb that provides the back story of A Darkness More Than Night.
It was originally published on January 5, 2005 in a collection of short stories called Dangerous Women and has since been re-released in a collection of three stories by Michael Connelly called Suicide Run.
Cielo Azul book description
(Description is for Suicide Run)
LAPD Detective Harry Bosch as we’ve never seen him before, in three never-before-collected stories.
In “Suicide Run,” the apparent suicide of a beautiful young starlet turns out to be much more sinister than it seems.
In “Cielo Azul,” Bosch is haunted by a long-ago closed case — the murder of a teenage girl who was never identified. As her killer sits on death row, Bosch tries one last time to get the answers he has sought for years.
In “One Dollar Jackpot,” Bosch works the murder of a professional poker player whose skills have made her more than one enemy.