Don't miss an action-packed, hilarious, heart-warming moment of the New York Times bestselling series that inspired the hit movies! The heat is on for Hiccup! Someone has stolen the Fires-Stone from Volcano Island, which means the Volcano has become active and the tremors are hatching the Eggs of Exterminator Dragons! Can Hiccup return the Fire-Stone to the Volcano, stop it from erupting, and save the Tribes from being wiped out by the terrible sword-claws of the Exterminators? This fifth adventure in the How to Train Your Dragon series is packed with the action, humor, heart, and remarkable illustrations that have made Cressida Cowell a beloved bestseller around the globe.