Nils is 13 years old, he lives with his grandfather and does not remember his parents. But one day he decides to climb into the attic, which holds terrible secrets. Or no, wait, Nils is 3 years old! He remembers both mom and dad, and remembers why they died, and almost remembers the killer... No, Nils is 34, he is a professor at the Sorbonne, an expert on the Etruscans. He is also an expert on the mysteries and traps of our memory. To solve the mystery, you don’t have to look for clues at all - you just need to find a lost record of memories where there is and always has been an answer. This book is the first detective story about Niels Hazard, a history professor and seeker of mysteries.