For Philip and his younger sister, Sireika, this year's Christmas seems destined to be a failure. Their mother is hospitalized, so they must stay with their strange aunt, Lidia, in a remote house in the middle of the forest. Aunt Lidia hates Christmas for reasons only she knows. But why did she name the hamster Nutcracker? What secrets does she hide from her grandchildren?

A mysterious message sends the two siblings on a dangerous adventure towards a discovery that changes everything! The book will challenge your logic as you'll learn how the story unfolds only if you solve the riddles. The wait for Christmas has never been so exciting!