When fifteen-year-old Marlee Stanley joins her two sisters and the sons of their family friends on a secretive hike in the middle of the night, she is thrilled and nervous. Battling her conscience, she prays that the hike will go flawlessly and that they will return to the safety of their campsite before their parents wake. The start of the hike is beautiful and wonderfully memorable. In a white flash so fast that Marlee can barely comprehend what has happened, an avalanche crashes into their path. Buried in packed snow, Marlee is forced to remember survival tips learned from her dad and her own research. This group of friends, ages eleven through seventeen, is about to endure bigger challenges than many adults have experienced. Digging out of the packed snow is only the first of many challenges. Injuries, cold, hunger, fatigue, aggressive wildlife and tensions in the group make this a much bigger adventure than they ever imagined. As the kids strive to exhibit Christian values throughout the trials, they learn numerous life lessons. But they are nearly out of food, and their energy is waning quickly. How will they ever reach help?

Marlee and her sisters are glad to be hiking again with the Miles boys. Their group of five is strong and cohesive as they explore the rugged mountains of Montana. When they first meet Thad, a dehydrated hiker on the trail, they offer first aid to help him recover. Thad seems harmless until he tells them to hike a few extra miles at sunset. When Lydie finds a hand-drawn map that Thad dropped, the group realizes that he is a modern day treasure hunter – and he decides that they're after his treasure. As they rush to flee from Thad, they make split-second decisions and find themselves in a unique set of dangers. They climb up unforgiving ridges, sneak through the night to avoid him, and experience a threatening thunderstorm. To make matters worse, Marlee becomes distracted with a nagging worry that Ellie might move away from home. What is God's plan for the Miles boys and Stanley girls? How will they get away from Thad before it's too late?

This summer the Stanley sisters and the Miles boys are excited to hike together again, and now they have the unique opportunity to help two of their ranger friends with an outdoor program in the beautiful Montana mountains. Marlee has always considered herself a willing follower. Give her a direction and she’s happy to help. Her older sister Ellie is a natural leader, and Marlee is content in her role as assistant. Marlee and her sisters have been assigned to help with Ranger Rose’s team, and they are savoring the adventure. But in a heartbeat while the group is divided by a few hundred feet, fire breaks out between Ranger Rose and Marlee’s group. In this enthralling finale to the Off the Itinerary series, Marlee must face her fears with courage that only God can provide.