Secret Service: Old and Young King Brady, Detectives
15. The Queen of Diamonds; or, The Two King Bradys' Treasure Case.126. The Bradys and the Banker; or, The Mystery of a Treasure Vault. A Detective Story of Finance
193. The Bradys in Mexico; or, The Search for the Aztec Treasure House
653. The Bradys After the Second Story Man; or, Tracking a Box of Treasure
685. The Bradys and the Twenty Treasure Chests; or, The Mystery of the California Clipper
709. The Bradys in Bondage; or, Tracking a Banker's Treasure
740. The Queen of Diamonds; or, The Two King Bradys' Treasure Case.
851. The Bradys and the Banker; or, The Mystery of a Treasure Vault. A Detective Story of Finance
918. The Bradys in Mexico; or, The Search for the Aztec Treasure House