The hit series is back, to charm and inspire another generation of baby-sitters! Mary Anne's mother died when Mary Anne was just a baby. And since it makes Mr. Spier too sad to talk about her, Mary Anne hardly knows a thing about her mother. She respects her father's feelings, but lately, she wants to know more. So Mary Anne does something she knows is wrong. She goes up into the creepy, ghostly attic in her and Dawn's house to look for evidence. And there Mary Anne finds something she wishes she'd never looked for . . . . The best friends you'll ever have are detectives, too!