The new American consul to Singapore asks trapper Frank Buck to search the interior for a missing American agent carrying the Japanese plans for an invasion of the Malay Peninsula.
Frank tries to free the kidnapped H.H. without sacrificing the Japanese plans for the invasion of Singapore.
Frank competes with an old friend and rival to see who can capture a black leopard for an important client, while Gloria tries to recover the stolen jewelry of an important American woman.
Franks answers a cry for help from a tribe living in a hidden inland valley, whose peace has been disturbed by Nazis mining uranium-bearing ore.
Frank gets involved with a missionary and her young charges when a downed American pilot dies at her mission after passing on information needed in Singapore.
Frank and Ali agree to guide Run Run Lee, an arms dealer, to the hidden headquarters of a warlord who claims to be a descendant of a Japanese samurai.
Ali and H.H. must find Frank and Gloria when their plane crashes in the jungle, a plight made more urgent by Frank's desperate need for medical treatment.
Frank's old friend Wilmer Bass asks him to take care of the Serengeti Kid, an old show lion who's sporting a golden collar sought by the leader of a dangerous killer cult.
Frank agrees to help a Nisei intelligence agent on a trip to infiltrate Japanese intelligence and to free a friend trapped in a pseudo prison run to provide slave labor for a local maharajah.
Frank is chained to Bhundi when the wily thief escapes from prison and is trapped into delivering a priceless necklace to two desperate crooks.
Frank has to protect an old flame from assassins when she returns from America to claim her father's throne.
Frank, H.H., and a pretty archaeologist desired by them both go in search of a skeleton believed to an ancient species of man.
Gloria asks Frank to guide an American agent into the interior, unaware at first that the man is General MacArthur and he's seeking the defense plans for the Malay peninsula.
An old girlfriend of Frank's is kidnapped by a white slavery ring.
Frank and H.H. stumble upon a Chinese triad that is planning to assassinate the Governor-General.
Frank and a lady photographer are captured by a fierce tribe ruled by an escaped convict, who gives them one chance to outrun the tribe's hunters.
Frank travels with a shipload of suspects when a series of nearly fatal accidents begin to plague him.