In a Deadly Vein
In a Deadly Vein, by Brett Halliday. Cover art by Bob McGinnis. (Originally titled "Murder Wears a Mummer's Mask", written in 1943, this printing: 1962.)
From the inside cover:
I'm on vacation when I meet this gorgeous trick with a head of golden hair that's worth half of Fort Knox. Her old man has found a mine worth the other half. Putting them together, she stacks up as a lucky girl.
Then she disappears. With her looks, and her old man's loot, I figure she's a diamond-studded candidate for the morgue.
That makes her my dish. After all, murder and blondes are my business.