The new thriller from #1 international bestselling author Guillaume Musso. PARIS, CHRISTMAS 2021. After a heart attack, Mathias Taillefer wakes up in the hospital with a stranger at his bedside. The mysterious girl reveals herself to be Louise Collange, a volunteer who has come to play the cello for patients. When she finds out that Mathias is a cop, she asks him to look into a very special case. Her mother, a former ballerina...