Alison has invited Lucy to come to Button House for a sleepover, but after a worrying meeting with the solicitor, Alison must work out if Lucy is really who she says she is. The Captain insists on utilising his skills in surveillance to help Alison find out the truth, but is he really up to the job? As one by one the ghosts are charmed by Lucy's character, Alison's guilt over questioning her becomes tinged with jealousy.