First, neighbor Mrs. Boggs is attacked and her dog killed by mysterious bean vines with rows of teeth inside the pods. Young would-be detectives Rick and Butch burn the vines, but the pods escape in a flying saucer; and later, en route to Butch's uncle's ranch, the two boys are sucked out of their airplane, landing dazed in the desert with more beans and flying saucer tracks nearby. Uncle Clint believes their story and so does his cook, a former professor, but before the professor can have the beans analyzed they chew a hole through his pocket and disappear. Rick sees a ghost, the boys are trapped overnight in a cave, and there's a run-in with an Indian village whose kids have got hold of some of the beans--but at last the spaceship returns in a furious storm and takes off with the last of the pods. The Air Force orders a cover-up--for once it's easy to take their advice and simply forget the whole silly business.