Roland Smith

Searching faraway world regions for Grace, who has been kidnapped by a ruthless grandfather who has also stolen two dinosaur hatchlings, Marty and his cryptozoologist uncle, Travis Wolfe, are distracted by a sighting of an elusive blood-drinking cryptid.

Amy and Dan Cahill are no strangers to impossible tasks. After seven of their relatives were kidnapped, the siblings scoured Europe for the priceless artifacts Vesper One demanded in exchange for the hostages. But then the Cahill kids are given an assignment that pushes them to their breaking point -- a journey to a legendary city. Amy and Dan know they can't afford to fail, yet they're running out of options . . . and running out of time.

Fifteen-year-old Peak Marcello is invited to climb Hkakabo Razi, one of the most isolated mountains in the world, but getting there involves a four-week trek through a tropical rainforest that is rife with hazards, which turns out to be more dangerous than summiting the mountain itself.