Double or Quits is a 1941 mystery novel by Erle Stanley Gardner, written under his pseudonym A.A. Fair, featuring his private detective duo Bertha Cool and Donald Lam. The plot involves the pair searching for stolen jewels and a missing woman, leading them into a dangerous case with a killer who uses murder as a solution, forcing them to confront deadly trouble. It's known for its hard-boiled style, typical of Gardner's work outside the Perry Mason series, and is part of the Cool & Lam series.

Very good condition with one single spine crease and corners very slightly worn.