Two young American couples are enjoying a vacation in Cancun, and make friends with Mathias, a German tourist. He and his brother Heinrich had been travelling together, and the latter has disappeared while investigating Mayan ruins with a woman friend. Mathias, concerned over the disappearance of his brother, persuades his tourist friends to help him track down his brother with the aid of a hand-drawn map the latter had left behind. After a punishing journey, the group come to a Mayan village where they encounter a distinctly unfriendly welcome. Leaving the village, they stumble across a hillside festooned with beautiful red flowers. But a Mayan is following them with a gun, and soon a body is encountered, shot full of arrows. As the above might indicate, this is by no means standard thriller territory, and Smith continues to defeat any expectations that readers might bring to his books. After a deceptive start, this turns into a much darker book than A Simple Plan, and actually defies comparisons to the earlier work, so distinctive is this new one. Readers are used to being taken on terrifying journeys, but this one is a humdinger.