Two best friends see their trip of a lifetime take a dark turn when one of them is struck by a mysterious affliction. Now, in a foreign land, they race to uncover the source before it consumes him completely.

When Samson Brion, an undercover cop, arrives in his native village in the depths of Brittany, fifteen years after having abruptly left it, most of the inhabitants see this return in a very bad light. Notably Lila Sept-Vents, an impetuous native entrepreneur, who is trying to save her online dating agency from bankruptcy. When a series of suspicious deaths strikes this quiet village, and Lila discovers that all the victims were clients of her agency, having a cop under her roof could prove invaluable.