10. The Leviathan

Complete story — includes the ending

When a supposedly uncrackable bank vault called the "Leviathan" is breached for the second time, Sherlock is called in to figure out what went wrong. The first time, the heist was committed by a once-in-a-lifetime teaming of four world-class criminals. They were all caught and imprisoned, so the vault company cannot imagine how anyone else got in. Sherlock learns that not even he can break into the Leviathan. He later surmises that four jurors at the trial of one of the robbers realized that the testimony they had heard was enough for them to recreate the safecracking method used. However, one of them is murdering the others to avoid sharing the $40 million they got away with.