YesterMorrow

Following the sudden death of his father, high-school student Harry Keller finds his mind full of strange visions of the past and future. Soon he can actually mentally leave "real" time and enter a place he dubs "A-Time," where other people’s lives unwind around him in twisting trails that he can see and touch — and change!

Unfortunately, A-Time is also inhabited by monstrous creatures called Quirks — deadly events trying to force their way into life trails so they can happen — as well as other humans who seek to distort the future for their own gain. In the first two books of this mind-bending new science fiction series, Harry begins to discover his ultimate purpose in A-Time.