Author Paul Moxham, an Australian writer, has published The Mystery of the Amphibious Jeep on Kindle. At 4.61 stars on Goodreads, it seems to be a popular kids story. Where the referenced ‘jeep’ is a Ford GPA SEEP or a DUKW (or something else), isn’t clear. Given the author’s Australian background and Australian Ben Carlin’s fame, I’m leaning towards it being a GPA.
According to the synopsis on Goodreads:
“After meeting an American adventurer who is travelling around the world in an amphibious jeep, the Mystery Kids invite him to spend the evening at Rose Cottage. However, the night has barely began when the jeep is stolen by two men.
What do the men plan to do with the jeep? Who are the stowaways? Why does the jeep go round in circles?
Set in 1950’s Britain, this adventure story will suit anyone who enjoys Nancy Drew, the Hardy Boys or the Famous Five”