"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....

Pat and Jen do everything together, including saving the day! But when Jen and Evil Jen find out they have one chance to find their long-lost mother in the Overworld, Jen's going to take it-even if it means that Pat can't join her on an adventure for the first time ever. With Mr. Rainbow's help travelling to the Overworld should be the easiest part, but when something goes wrong, Jen and Evil Jen wind up trapped in the nether. Right about now would...

"Pat thought being mayor was hard--but now, it's more than just the village that's in danger. Captain Cookie has been struck by a terrifying vision. He's learned that if anyone dares disturb the Cookie Islands, it will trigger the destruction of all the realms of existence! And Jen has just found the final clue to find the islands by herself! Now Pat and his friends have to go back to the Overworld, through the Nether, and to the Underworld to stop...