Fifteen-year-old Savanna Gilson, a quick-tempered loner, prickles at any threat, real or imagined. She fears she may never escape the pull of Earth’s gravity or, more generally speaking, most people, but without them she won't solve her grandfather's secret.
Rylie’s migraines trigger more time slips. She never knows where she’ll end up or which ancestor she’ll encounter. No one can find out or they’ll think she’s crazy. Rylie isn’t so sure they’d be wrong, but the time slips may be the key to saving her brother's life.