Title: The case of the surprise call
Description: When Mary-Kate and Ashley get to their great-grandmother's detective clubhouse, they discover that someone had broken in. Was it the singing dragon, the giant bunny, or the mysterious stranger that kept calling them?
Subjects: Juvenile fiction, Mystery and detective stories, Children's fiction, Olsen twins (fictitious characters), fiction, Twins, fiction
People: Ashley Olsen (1986-), Mary-Kate Olsen (1986-)