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

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

Sofia tries to fathom the secrets of interdimensional travel.

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

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

Sam must deal with his friends’ inexplicable disappearance.