di Mel Lyle
A Power Boys Adventure di Mel Lyle raccoglie 6 libri in ordine di lettura.
The Mystery of the Haunted Skyscraper
1964
The Mystery of the Flying Skeleton
The Mystery of the Burning Ocean
1965
The Mystery of the Million-Dollar Penny
The Mystery of the Double Kidnapping
1966
The Mystery of the Vanishing Lady
1967