Out of breakfast food, Brian the duck goes hunting for his best friend Gregory, and although there are plenty of other ducks around doing strange and potentially interesting things, Gregory is nowhere to be found.

Soon after Cruz, Sailor, Emmett, and Lani return for their second year at Explorer Academy, their sense of calm is shattered when Sailor's older sister goes missing. Amidst incredible expeditions to far-flung destinations and competitive classes, Sailor bravely steps into the lead to discover how her sister's sudden disappearance may be linked to an illegal and deadly animal-trafficking ring. Despite winning the prestigious North Star Award and being...