A romantic triangle leads to death---but was it murder?
Derek's problem: his key to a narcotics ring died too soon.
Derek is called to stop a terrifying game played by two hunters.
Torn by her love for a hunter and her husband's money, a woman commits murder.
Derek agrees to help a woman find her fiance, missing on a safari.
Derek suspects a murdered private detective was involved in a blackmail racket.
Derek investigates insurance claims made by two money-hungry prospectors.
A counterfeit bill becomes a pivotal clue in Derek's murder investigation.
Derek searches for a woman journalist missing in Mombasa.
Derek tangles with a racketeer involved in hashish smuggling.
Derek is after a fugitive from a mental hospital.
Derek suspects murder when five settlers are supposedly killed by a leopard.
Escaped convicts involve a farmer and his wife in their getaway.
Derek chases a young murderess fleeing trial.
Three people confess to the murder of a blackmailer.
A young surgeon lacking confidence is forced to operate on a fleeing robber.
A farmer facing foreclosure is suspected of murder.
Villagers believe a renegade has magic powers.
When a policeman is wounded by a poison dart, Derek must search for an antidote.
A vet is accused of hindering attempts to diagnose a cattle disease.
At a trading post, a woman sparks jealousy ... and murder.
A witness attempts to blackmail a killer.
What is the secret that is driving Del Collins to suicide?
Derek accompanies a group of settlers on a perilous journey to Kenya's Lake Tula.
Murder complicates the search for a stolen cross.
Ralph Carey murders his wealthy twin brother and assumes his identity.
Derek sets out after two fugitives holding a young bride as hostage.