It Could Have Been Murder centers around three friends who begin a murder adventure business, Diamond Teams, a company helping teams or individuals plan out all aspects of a murder: selecting a target, every detail and contingency—all without actually murdering anyone–followed by a granular debrief with the client. Every client goes through an extensive vetting process to ensure Diamond Teams doesn’t assist someone in actually murdering a target. After 20 years, though, one client slips through. His project is terminated, and he now wants revenge. Diamond Teams must come up with a plan to deal with the ex-client, but his strategy is different than anyone had thought. Diamond Teams has to get ahead of the former client before he harms one or more people.