Dennis Lenahan is a professional diver. His signature jump attracts many spectators. Dennis is happy with his life. Suddenly, everything changes dramatically: a diver accidentally witnesses a cold-blooded murder and turns into a target for the mafia. The matter is complicated by the fact that all the residents of the city are enthusiastically participating in a theatrical battle of the Civil War, and Dennis needs to know for sure whose guns are firing blanks and whose with real cartridges...