After over a millennia, Project Ark ship's core, whatever it is, has stopped working. And it's being sabatoged- they've already lost multiple rooms. But as the world of the pilgrims gets smaller and smaller, the concentration finally decides- to draft teenagers through adults to find, and repair, the core. Warner Brooks is one of those searchers- but can he survive the thousand-year-old floors of the Ark ship's lower levels?