"After the monster apocalypse, Jack Sullivan has been having an awesome time living in a tree house with his three best friends. But when zombies start mysteriously disappearing, Jack and his friends suspect that an extremely evil force is at work"--

"After Pat and Jen saved Bomby, their cat Cloud, and one hundred friendly zombies from the clutches of Evil Jen and brought them home from the underworld, they thought their adventuring days were over. But ever since their return, more mysterious new holes have started appearing--and more and more of their friends have started disappearing! After Jen stumbles into one and Pat rushes after her, they find themselves trapped in a dark, dank boomium mine....

It's been forty-two days since the monster apocalypse hit town and pretty much everyone ran away or got zombified. Average thirteen-year-old Jack Sullivan is holed up in his tree house, which he's armed to the teeth with catapults and a moat, not to mention video games and an endless supply of Oreos and Mountain Dew scavenged from abandoned stores. But Jack alone is no match for the hordes of Dozers and Winged Wretches and Zombies, and especially...