On a small snow-covered island-so tiny that it can't be found on any map-lives twelve-year-old Minou, her philosopher Papa (a descendent of Descartes), Boxman the magician, and a clever dog called No-Name. A year earlier Minou's mother left the house wearing her best shoes and carrying a large black umbrella. She never returned.

One morning Minou finds a dead boy washed up on the beach. Her father decides to lay him in the room that once belonged to her mother. Can her mother's disappearance be explained by the boy? Will Boxman be able to help find her? Minou, unwilling to accept her mother's death, attempts to find the truth through Descartes' philosophy. Over the course of her investigation Minou will discover the truth about loss and love, a truth that The Vanishing Act conveys in a voice that is uniquely enchanting.