The police insist the killer is a mad beast. Harriet thinks that the phantom recently seen at Collinwood is responsible. Barnabas suspects that Quentin Collins, disguised as a wealthy hippie, is guilty. Where will they find the murderer? In the nightmare world of Harriet's dreams? In the haunted cave beneath the Collins' family cemetery? Or in another century -- when witchcraft and demonology threatened Collinwood?