Sienna comes from a family of Travelers who have the incredible ability to jump through time, providing they stick to a set of rules that ensure history remains as it should be, deaths take their natural course, and the future isn't altered.
Sienna has always stuck to the rules, even when her heart was torn apart by the death of her boyfriend, Henry. But when her best friend and his sister, Joan, bends the rules of Travelers in order to bring him back to life, Sienna's past and everyone involved in it is erased, and Joan seems to stop at nothing to ensure Henry remains alive.
