The Mary Valley Rattler (or 'The Valley Rattler'), is a tourist train which runs through the Mary River Valley in Queensland, from Gympie to the small country town of Imbil. It is a restored C17 class, steam locomotive which originally ran in the early 1920s. The tour is conducted by the Mary Valley Heritage Railway, a not-for-profit organisation, with a few paid workers assisted by many volunteers. It is the third largest heritage railway in Australia.
This is a fictional story about a crime committed during one of the tours. Once again, the Sunshine Coast's favourite private eye assists in solving the mystery of the 'Death on the Valley Rattler'.