Ten people are invited to go on an African safari, only to find that an unseen person is killing them one by one. Could one of them be the killer?

An adventurer (Hamilton) decides to go in search of the lost city in the Amazon jungle. A motley crew of other people with reasons of their own decide to join him for the wealth of the lost city. But to their horror they find out ...

When Henry Jekyll's experiments with cocaine have gotten out of control, he transforms into the hideous Jack Hyde. As Hyde he searches the London streets at night for his prey in whorehouses and opium dens. The police can't catch ...