I really wanted to enjoy this more, and there were great glimmerings, too. But a few things stuck in my craw, particularly the seeming disconnect between the younger people and the adults, the overused trope of 'things' in the 'timestream' and, of course, the reliance on the paradox of being in two places at once. It's unfair because these would work well if you weren't already saturated with the genre, but originality is hard to come by when you're pushing the bounds of theoretical time travel.