I've read a little James Ellroy before. A short story collection based around his novella "Dick Contino's Blues." Contino was a real musician and actor, one of his movies having been immortalized on Mystery Science Theatre 3000. Speaking of movies I've also seen the 1997 adaptation of LA Confidential. And I once read an interview with him where he kept bringing the convo back to how much manly heterosexual sex he was having with his girlfriend, which tends to make one wonder.
The Big Nowhere shares the Confidential format of jumping from the POV of one protagonist to another, three in all. Danny Upshaw is a sheriff's deputy investigator, and the most ethical of the three. Mal Considine works for the DA's office and is marked by ambition and being in an ugly custody battle. Buzz Meeks has connections to both Howard Hughes and Mickey Cohen, and has a certain laid back rogue appeal.
Between them and other figures in LA's, um, justice system, they follow two cases. One is a Res Scare investigation against a film industry union that does have Communists leading it, but which is mostly under fire so that studio bosses can stiff them on contracts. (It's more timely now than you might expect.) The other is a sex-murder case with a jazz musician as victim, a crime the details of which break the Yikes Meter. Upshaw is initially the only one interested in the latter, which is why I'm calling him the most ethical, but there are signs the two cases might not be completely separate.
It's a dark and cynical story, but in an engaging way. There's a sense of things always moving in the background. And a lot of fascinating if none-too-sweet minor characters, like Terry Lux, an alleged doctor with a clinic and maybe not the strongest set of morals.