A griffin enters the human world and goes on many misadventures.

Ben and his adopted parents are devoting their lives to protecting rare and fabulous creatures (like dragons) and at the moment they are trying to save the last of the winged horses, Pegasus unicus; there are three eggs, but without their mother they will not survive and the only hope is to obtain a Griffin feather--but Griffins are enemies of the dragons, and may not be willing to help.

"Rowan is now the Royal Monster Hunter, and her twin brother, Rhydd, is destined to be king. But her mother's cousin Heward is still determined that his children be the ones to inherit the titles, and will stop at nothing to show that Rowan and Rhydd are too immature to properly lead. After the gryphon that Rowan captured in Book One gives birth but then dies, Rowan is left with a baby gryphon she knows she cannot keep. And it grows faster than anyone...