Cinnamon Bay seems like the ideal Caribbean getaway. But for Harvard economist and amateur detective Henry Spearman it offers an unexpected and decidedly different diversion: murder. With the police at a loss, Spearman investigates on his own, following a rather different set of laws—those of economics. Theorizing and hypothesizing, Spearman sets himself on the killer’s trail as it winds from the perfect beaches and manicured lawns of a resort to the bustling old port of Charlotte Amalie to the perilous hiking trails of a dense forest. Can Spearman crack the case using economics—and before it’s too late?