Really, this second half is mostly legwork in Marlowe's part, with when you think about it the main action being kinda shoehorned in - there's not really necessarily any reason for Frank to be holding him up with a gun when he just comes to talk, and there's not much reason for the cop to be ready to shoot him, when everything Marlowe wants pretty much goes along with what he wants as well. But it'd be seem slow for a hard-boiled detective story without that!
And man, for someone who doesn't much seem to love her husband or anything, she's pretty quick to throw his name around and such. Marlowe has to specifically ask for hers. Yeesh. Poor girl, all around.
And aww, Marlowe's such a faithful puppy, to the woman who saves his life and all. Even to the point of getting different pearls made so that she won't realize her own ones she had were a fake. Sweet of him.
Everything is all rather convoluted, although it's made worse by the dialogue which I don't understand bits and pieces of, which loses some of the sense of the story! And it's not helped by people having multiple names and things, yeesh.
Hrm, what am I forgetting to talk about?