Deep into the Dark (Detective Margaret Nolan #1) by P. J. Tracy; 2021. Hardcover.

Sam Easton--a true survivor--is home from Afghanistan, trying to rebuild a life in his hometown of LA. Separated from his wife, bartending and therapy sessions are what occupy his days and nights. When friend and colleague Melody Traeger is beaten by her boyfriend, she turns to Sam for help. When the boyfriend turns up dead the next day, a hard case like Sam is the perfect suspect. But LAPD Detective Margaret Nolan, whose brother recently died serving overseas, is sympathetic to Sam's troubles, and can't quite see him as a killer. She's more interested in the secrets Melody might be keeping and the developments in another murder case on the other side of town. Set in an LA where real people live and work--not the superficial LA of Beverly Hills or the gritty underbelly of the city--Deep Into the Dark features two really engaging, dynamic main characters and explores the nature of obsession, revenge and grief.