Valiant

Seventeen-year-old Sara has seen her brother die fifteen times. He's drowned, burned to death, and overdosed. Been shot, stabbed, and crushed. No matter how hard she and her friends try, no matter how many times she jumps back through the portal of time to save him, she fails. And with the death of her brother always comes an alien invasion that ends the world.

But this time is going to be different?this time he's going to live. Sara is going to make sure of it. With the help of the boy she loves, maybe, just maybe, if she can save Gabe, she can save them all...