Diving Adventure

by Willard Price

Published 5 November 1970
'He left them there to die...' Hal and Roger Hunt dive straight into danger on a specimen-collecting trip to Undersea City. But it's not just sharks and killer whales the brothers have to fear when they are plunged into the depths of another adventure.

Volcano Adventure

by Willard Price

Published December 1956
'Fountains of fire, explosions ...it's hell let loose.' Hal and Roger Hunt embark on an earth-shattering expedition when they join forces with world-famous volcanologist Dr Dan Adams. And as their ground-breaking research of the volatile Pacific volcanoes hots up, the brothers' mission erupts into an awesome adventure...

Lion Adventure

by Willard Price

Published April 1967
The human bait was the boys themselves...Hal and Roger Hunt have been sent on a terrifying mission - they must save the population of Mtito Andei from a man-eating lion. But the 'King of the Beasts' isn't the only thing trying to kill the boys...Have the brothers bitten off more than they can chew this time?

Gorilla Adventure

by Willard Price

Published June 1969
Hal and Roger Hunt head off for another challenging mission-this time to search for gorillas deep in the Congo jungle. But when the boys stumble across the evil trade in baby gorillas, someone seems determined to silnece them once and for all.