Maxwell's Ride — M.J. Trow

It's a busman's holiday for Peter 'Mad Max' Maxwell, saddled with two precocious nieces who insist he takes them to a theme park. While riding, white-knuckled, the Wild Water, a passenger is killed in the float ahead, and Maxwell and the girls become eyewitnesses to murder.

The dead man was an accountant working with CHARTS, a charity organisation sponsoring Leighford High School where Maxwell works. With the help of a local reporter, Mad Max delves into CHARTS and discovers a complex web of murky secrets and financial chicanery.

The corpses multiply as Maxwell nears the end of his search for truth -- but will one of them be his own niece . . . ?