Used book – Douce nuit, Mary Higgins Clark

Seven-year-old Brian has only one thought, one hope: the St. Christopher medal, given to him by his grandmother, could save his father's life, hospitalized for a serious illness... His grandmother says so, and she can't be wrong.

So, when a stranger runs off with the wallet that fell out of his mother's bag, where the medal is, he doesn't hesitate to chase after her, abandoning the magic of the illuminated Rockefeller Center on Christmas night.

And the nightmare begins, for Brian, for his mother, masterfully woven by the queen of suspense, author of The Night of the Fox (Grand Prix de littérature policière 1980) and Dr. H's Clinic.