One by one the Solar System's ships were disappearing in mid-space - as if a mighty colossus had grabbed them up and swallowed them whole.Top agents Joan Randall and Ezra Gurney were sent to investigate. Like the others, somewhere beyond Jupiter, they disappeared. Captain Future heard the news with shocked horror. Whatever the danger, he had to stop this menacing evil force. Whatever the risk, he had to find the lovely Joan Randall - the woman he loved...