Alex has been working for 72 hours, when he is surprised by an invitation to enter a virtual chat. On the other side, Sarah says she's stuck and asks for help. What might, at first, sound dangerous, becomes unbelievable, when, after some messages, they conclude that she is talking about the future, through a window of time.

The difference between them is exactly one year. Alex, at first, doesn't believe it, but Sarah guarantees that she can prove that it is possible. She tells him to go to Copacabana beach that day at noon and describes a sequence of scenes that will happen. He goes and confirms. Then, seeing her for the first time, he falls in love.

Now, he has exactly one year to approach her, to gain her confidence and to save her from a danger in the future that he has no idea how he started.