Retz and Sofia have devised a strategy. But nothing goes to plan.

Sofia tries to fathom the secrets of interdimensional travel.

Romane and Victor get a shock when they go back in time to the world they used to live in.

Four years later, Victor tries to persuade Romane to follow his plan to send them both back in time.

Victor and Romane must learn to live with Samuel and Bilal’s disappearance.

Sam must deal with his friends’ inexplicable disappearance.