Lila Gueneau

Two sisters, aged ten and twelve, are about to leave their beloved island, which has become too expensive for their family. Their sadness turns into rage towards those forcing them to leave: the tourists. This last summer will be dark, deadly, as toxic as the seaweed swarming over the beaches.

Margot and Marguerite are 12-year-old girls who seem no different from any other youngsters with the usual family and peer problems. While they appear to have similar faces and body shapes, they wear different clothes and hairstyles, but the biggest difference between them is that one lives in 1942 and the other in 2020. When the girls crawled into a wooden chest they were magically sent into each other’s timeline, and because the girls look so similar their family and friends do not notice the swap.

A young female detective is put in charge of a case and must delve into her partner's mysterious past in order to solve it.