Brooke's always out on the trail, living a life full of adventure and documenting her wilderness findings in her nature diary. But Brooke is in for the biggest adventure of her life: her BFF, Jayla, is now her new stepsister! Brooke finally has someone to join her on the trail, and, together, they just might spot the one thing Brooke's been aching to see most-a moose! Brooke and her blended family are settling into their new life nicely, but when Jayla announces that she and her dad spotted a moose on the trail while Brooke was back at camp, life in the family RV suddenly starts to feel crowded.