For Palmer Overstreet, there's something odd about a run-of-the-mill armed robbery that he just happened into. For one thing, the robber seems more interested in shooting at Palmer, a bystander, than in emptying the till. But the robber ends up dead on the street, and Palmer is not sure who's trying to kill him or why. Belmont Arsenal introduces you to a colorful cast of characters connected by family and friendship, as Palmer's cousin, private detective Johnny Dagistino, tries to crack the mystery of who'd want to kill a nice insurance guy.