"Jack and Lilly are no strangers to heroics. They've befriended dragons, battled giants, and even earned the loyalty of a goblin army. So when they meet Zita the Spacegirl, fresh from her interplanetary travels and seeking their help to face a new threat, they're more than ready for another adventure. But the danger growing just outside the door to their world is greater than anything the new friends could have imagined"--