Jake, posing as a defecting U.S. scientist, and Sarah search for an experimental German bomb and a famed black pearl.

Jake and Corky are imprisoned on an island penal colony when they try to free the son of an Englishman.

Sarah receives a mysterious trunk from her late father and it leads her to a lost civilization.

Jake leads the search for a downed plane flown by a former Flying Tiger transporting a prototype gunsight of interest to the Japanese.

Jake is followed by the brother of a Japanese pilot he shot down while he was still a Flying Tiger in China, and Corky struggles to avoid a prearranged marriage.

Jake is shot down and rescued by an Amish widow and her son, who hide him from the Japanese occupying their island.

Jake and Corky fly to the Philippines to explore the reports of Sarah's death while on a mission involving MacArthur.

Jake tries to help a former baseball hero who is accused of murdering a local girl on Boragora.

Jake and Sarah help an abandoned boy found living among the apes on an isolated island.

Jake helps foil an attempt to hijack an ocean liner carrying the Duke of Windsor.

Jake acts as a bodyguard to a lady gambler during a high stakes poker game.

An old friend of Jake's turns up on Tagataya looking for help with a mission of mercy.

A Clipper pilot is beaten and his bride apparently kidnapped by Princess Kogi and held for ransom.

Louie is sentenced to the guillotine for murder, and his only defense is an old story he doesn't want to get out.

An ambitious newswoman tricks Jake into flying her to Princess Kogi's island for an interview with the Japanese defense minister, a recent target for assassination.

Jake's prospector buddy stands to lose his platinum strike to an unscrupulous businessman from the States.

Sarah is used as a scapegoat by an island revolutionary who accuses her of removing a sacred statue from a cemetery on the island.

Princess Kogi hires Jake as a bodyguard after an attempt on her life during a birthday celebration.