The Marvellous Boy is a 1982 Australian crime novel by Peter Corris. It was the third novel featuring Cliff Hardy.
Cliff Hardy is hired by the matriarch of a wealthy family to track down a long-lost heir.
"Marvellous for the boys who like tough guy fiction," wrote the Sydney Morning Herald.
"Corris keeps tension high" wrote The Age.
The Canberra Times wrote "there is hope that when Hardy stops being a reasonable facsimile of police roundsmen I have known and gets more into his detective role he'll be a good one."