Bestseller Rollins (Subterranean) explores the genetic engineering theme popularized by Jurassic Park, if less imaginatively than, say, Warren Fahy did in his 2009 debut, Fragment, in this solid stand-alone thriller. During the looting of the Baghdad zoo in the early days of Operation Iraqi Freedom in 2003, 12-year-old Makeen and his younger brother observe two men, one dressed in a khaki military uniform and the other in a dark suit, remove a large metal briefcase containing embryos from a secret facility at the zoo. About five years later, a U.S. Border Patrol helicopter lands at the New Orleans Audubon Center for Research of Endangered Species to take Dr. Lorna Polk, a postgraduate resident, out over the Mississippi Delta to an abandoned trawler. In the boat Polk sees cages filled with bizarre creatures like Siamese twin capuchin monkeys and oversized vampire bats.