Violence strikes close to home for park ranger Tony Wagner with the brutal murder of Blake and Jill Fisher. Their teenage daughters, Christi and Terri, have vanished. Tony finds evidence that the kidnappers took the girls into the mountains rather than leaving by road. Widely scattered signs keep him looking until he finds a clear trail. FBI agent Wyatt Garret joins Tony as he tracks deep into the Rockies. The unstable, late spring weather is the least of their problems. And finding the girls is just the beginning. Tony faces the greatest challenges of his life. And the things he does to survive will change him forever.