Valley of Monsters - Island of Fog, #7

What happens when a shapeshifter dragon is bitten by a werewolf? Everyone in the village is looking at Hal with suspicion. Even his friends are wary. Not only did he blow up Bad Rock Gulch and create havoc across the land, now he has werewolf blood coursing through his veins. It's time to get away for a while - and he has just the mission! Recalling a vision of a long-lost boy named Chase, and armed with clues as to his whereabouts, Hal sets off with a few friends on a journey to find him as well as the elusive shapeshifter twins Bo and Astrid, a couple of sphinxes who also vanished without a trace. Finding them might just answer more questions than they could possibly imagine... The seventh book in the series explores Miss Simone's childhood and brings home an important scientific breakthrough.