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One December morning, a corpse is found on the floor of room 622 of a luxury hotel in the Swiss Alps. The police never manage to solve the case, and over time, many people have forgotten what happened.

Many years later, writer Joël Dicker comes to the same hotel to recover from a breakup. He has no idea that he will end up investigating an old crime, and not alone: Scarlett, a beautiful guest and an aspiring writer staying in the next room, will accompany him on his quest, and will also try to figure out how to write a good book.

What happened that night? The answer to this question will be found in this devilish detective story, built with the precision of a Swiss watch. Joël Dicker finally brings us to his native country to tell us about an investigation that combines a love triangle, games with power, betrayal and envy in a not-so-quiet Switzerland, where the truth is very different from anything we have imagined.