"I'm in trouble, Liz. I've uncovered something . . . They're watching . . . I'm going for help tonight and will contact you as soon as I'm able." That panicked message on her answering machine was the last time Liz Ames heard from her sister Rachel. The police believe Rachel Howard, pastor of Paradise Christian Church in Key West, Florida, suffered an emotional breakdown and ran off. Her behavior had become increasingly bizarre, her sermons dark, frightening. Besides, women didn't meet untimely ends on the island paradise. The police quickly closed the case. But Liz is convinced her sister's disappearance wasn't self-imposed. Fleeing a shattered marriage and a career on hold, Liz moves to Key West to prove her suspicions, her only clues her sister's cryptic phone message and a page from Rachel's journal bearing the Image of a strange, horned flower.