"Paris, Christmas 2021. After a heart attack, Mathias Taillefer wakes up in a hospital room. An unfamiliar girl stands at his bedside. It's Louise Collange, a student who has come to play the cello for the patients on a voluntary basis. When she learns that Mathias is a cop, she asks him to take over a rather unusual case. Initially reluctant, Mathias finally agrees to help her, plunging them both into a deadly spiral. Thus begins an extraordinary investigation, the secret of which lies in the life one would have liked to lead, the love one could have known, and the place one still hopes to find..." ~ from goodreads.com