As Grady Potts' political star rises, Daniel finally realizes what he must do to ensure he doesn't poison the world's population, and it isn't pretty. Natasha is on hand-actually, both Natashas are-but the consequences of his actions may change the future for the worse. Heidi is still imprisoned, but just like Billy, she's got an advocate on the outside. In this explosive final volume of the critically-acclaimed series, the fate of the world will...

"On their way to bury a time capsule, five friends - Grady, Heidi, Natasha, Daniel, and Billy - uncover a metal bunker buried deep in the woods. Inside, they discover letters addressed to each of them... from their future selves! Told they will destroy the world in the very near future, the friends find themselves, over the next few days, growing further and further apart. Though they've been warned against making the wrong choices, how do they know...