Em holds the key to the future and it's written in her own handwriting. A cryptic note sent from a past version of herself lets her know what she must do in the present in order to prevent mass chaos - but it may mean sacrificing the one thing in her past that she wants to hold onto.
Marina leads a coddled life, but it means nothing to her without her childhood friend James. Even though he sees her as nothing more than that, she's dedicated to making him realize her true feelings. She has never understood why James puts up with the bedraggled Finn tagging on their heels all the time, getting in the way of her opportune moment to declare herself.
But Finn is there for James when their world falls apart one fateful night, and Marina begins to see the his value. It may be too late though. As attacks on James' life continue, Marina and Finn band together to protect their mutual friend from two teens who always seem to know what their next move is.
Em fights for her freedom in the future, eluding the dark and sinister Doctor in order to complete her mission. But her path is set to collide with Marina's - and their mutually exclusive goals will challenge them to question what they each value most.