Gertrude, Gumshoe: Slam Is Murder - Gertrude, Gumshoe Cozy Mystery Series, #4

There just isn't enough crime in Mattawooptock, so Gertrude has to convince Calvin to go to the big city-Portland, where she will go undercover as the newest slam poet on the scene. But have any actual crimes been committed, or is this just Gertrude's wild imagination at work? (This is Book 4 of the Gertrude, Gumshoe Cozy Mystery Series.)