Allen, a science writer with the St. Louis Post-Dispatch, tells the 14-year story of the landmark Guanacaste National Park project, begun in 1986 in northwestern Costa Rica. Envisioned by Costa Rican and U.S. scientists and driven to fruition by the maverick University of Pennsylvania ecologist Daniel Janzen, the project evolved into the world's first large-scale restoration of a tropical forest from its tattered remnants.