Grennan, who once worked at the East West Institute in Prague, embarked on a round-the-world trip in 2006, starting with a stint volunteering for an orphanage six miles south of Kathmandu. The orphanage, called the Little Princes Children's Home, housed 18 children from the remote province of Humla, rescued from a notorious child trafficker who had bought the children from poor villagers terrified of the Maoist insurgents eager for new recruits; the parents hoped to keep their children safe, but the children often ended up as slaves. Grennan was stunned by the trauma endured by these children, who he grew to love over two months, and after completing his world tour, returned to the orphanage and vowed not only to locate seven Humla orphans who had vanished from a foster home, but also to find the parents of the children in the orphanage. This required starting up a nonprofit organization in America, Next Generation Nepal, raising funds, buying a house in Kathmandu for the children's home, and trekking into the mountains of Humla to locate the parents. Grennan's work is by turns self-pokingly humorous, exciting, and inspiring. (Feb.)