51 books • 2 series
Book #10: Hammer Spade and the Final Quest
Book #1: Hammer Spade and the Case of the Missing Husband
Book #2: Hammer Spade and the Diamond Smugglers
Book #3: Hammer Spade and the Merchants of Death
Book #5: Hammer Spade and the Midnight Treader
Book #6: Hammer Spade and the Long Shooter