25 years after an act of bio-terrorism wiped out humanity...Sixteen-year-old Larkspur lives in a hidden colony at the base of mountains in the former state of Wyoming. She is protected in an enclave of secrecy and relegated to stay within a two-mile radius of her home at all times. But despite her parents' ever-present worry that death awaits those who travel outside the perimeter, Lark longs for adventure beyond the colony's protection. As family...