Katherine Forrest's novels really depend on what kind of mystery you're after. She's best known for the Kate Delafield series, which are lesbian detective novels starting in the early 80s. If you want to understand her impact on the genre, you have to start with 'Amateur City', the first Kate book. It's a foundational text. The early ones have this raw, procedural feel that captures a specific time in LA and in queer life. The later books, like 'Sleeping Bones', get more polished on a sentence level, but they lose some of that urgent, groundbreaking atmosphere for me.
I'd actually argue against chronological order if you're new to older queer genre fiction and find the pacing a bit dated. 'Murder at the Nightwood Bar' is a stronger, more emotionally complex entry point. It's the second book, but it stands alone well and tackles the community's relationship with its own spaces in a way that still resonates. Forrest wasn't just writing mysteries; she was documenting a world that mainstream publishing ignored.