“Murder at the Margin” by Marshall Jevons is a mystery book about a man named Henry Spearman whom solves crimes by using the mindset of an economist. He looks at the world and various different life situations with the perspective of an economist and relates many life incidents and peoples actions back to principles of economics. As he begins a new vacation on a Caribbean island he comes across a new case to solve, one of murder. General Decker was murdered by poising, and soon after Henry Spearman finds this out he start investigating people on the island that might be guilty of committing this crime. He pays close attention to the actions and habits of the the many unique guests of the hotel and notices patterns that either turn them into