Alex Mata doesn't want to worry about rumors of alien incursions - he'd rather just skate and tag and play guitar. But when he comes home to find an alien has murdered his parents, he's forced to confront a new reality: Aliens are real, his parents are dead, and nobody will believe him if he says what he saw. On the run, Alex finds himself led to the compound of tech guru Jeffrey Sabazios, the only public figure who stands firm in his belief that aliens are coming.At Sabazios' invitation, Alex becomes a "Witness" - one of a special group of teens gifted with an ability that could save the Earth: they can glide through time and witness futures. When a Witness sees a future it guarantees that it will happen the way it's been seen, making their work humanity's best hope for controlling what happens next and stopping the alien threat. Guided by Sabazios, befriended by his fellow time travelers, and maybe even falling in love, Alex begins to find a new home at the compound - until a rogue glide shows him the dangerous truth about his new situation. Now in a race against time, Alex must make a terrible choice: save the people he loves or save the world instead.Debut author Constantine Singer's fresh-voiced protagonist leaps off the page in this captivating novel that weaves sci-fi and contemporary fiction.