RB-043 The Crusher

An Airfreight plane crash lands at Knotty Pine Airport. The plane's cargo is placed in a hanger for security and for inspection. An airport tower operator is killed while inspecting the plane's cargo for damage. The man appears to have been crushed to death by some animal. Bill and the rangers are called in to find and capture whatever killed the airport worker. What killed the man? Can the boys identify the killer? Will it kill again? Can the rangers find this menace before it finds them?