While exploring a trolley car museum, eleven-year-old Mary Rose and her younger sister Jo-Beth encounter voices from nowhere and other strange events that make them think the museum is haunted.
Asked to tightrope walk for the queen's birthday party, Muriel arrives to discover that all the decorative paper lanterns have disappeared and that her detecting skills are needed too.
When their little sister doesn't come home from school, fifteen-year-old Maggie and her brother must face up to some deep, dark secrets about their natural mother, whom they must consider as a kidnapping suspect.
