The Dreamwalker's Child — Steve Voake

Fifteen-year-old Sam Palmer's life is dull--until a bizarre bicycle accident leaves him in a coma. Sam awakens in Aurobon, a world eerily similar to his own, only to discover that his "accident" was part of an elaborate abduction by a ruler with a deadly agenda. Now Sam must team up with a fearless girl pilot to outwit the enemy. Otherwise, dark forces will invade his own world on insects the size of fighter jets. But that's if the terrifying marsh dogs don't kill him first.