This in an adventure story about two sisters and their brother, who are forced to leave their parents and hide on a desolate moor from the police and an assassin who might kill them: the three of them are trapped on the moor, unable to leave it and return home. In a state of Limbo, they meet two friendly ghosts, who take them to the cottage of an old woman. She looks after them, giving them beds of straw to sleep on, and feeds them. She tells stories of strange happenings on the moor. And of evil people on the moor. It is hoped that with the help of this old woman, the two girls and the boy will find a way of leaving the moor. But first they must get rid of the most evil ghost, Jackdaw: when alive, he was a Highwayman and a Robber.