When Taylor, Jordan, and Zach run after their little brother, Zayne, while on a family hike, they don't expect him to lead them through a portal into another world: Tir Gaeltacht. Guided by a young dragon, they start off on the adventure of a lifetime. Their cousin, who finds a portal of his own, soon joins them. They are surprised to find that their arrival has been anticipated by the inhabitants, and that they're expected to help save their world. Can the siblings - with the help of their bond-mates, a Dragon, a Gryffin, a Winged Horse, a White Stag, and a Giant Wolfe - overthrow the evil queen and restore the rightful ruler to the throne? And if they can do all that, will they ever be able to make it home?