Erle Stanley Gardner 
Cats Prowl at Night [EPUB ebook] 

It was just a routine case. All Bertha Cool had to do was help a fellow in a jam — a $20, 000 jam. But it didn’t stay a routine case for long. All of a sudden Bertha’s client had a fistful of anonymous letters, a missing wife, and a body in his basement. Bertha Cool had her hands full. The only problem was, her hands were tied — and the murderer’s were very, very busy.