Holger Broman is a senior lecturer at the university of Lund. He comes to spend the summer at the castle of Glimmingehus, uncovering medieval paintings hidden under the plaster. He befriends the tour guide Nils Jeppsen and a young girl who lives there, Maj. There are two ghosts in the castle, bound to the castle by a curse many centuries ago. They hope that Broman can remove the curse.