When his sister is bitten by an injured bird she tried to rescue, Cooper must figure out what's going on when she starts perching high up in trees, gathering sticks to hide in her room and refusing to eat her favorite foods.

"The last kids may have escaped the forbidden fortress by the skin of their teeth, but there isn't much to celebrate. Thrull has what he needs to complete the Tower, Rezzoch will most certainly come to Earth, and the world as they know it will cease to exist. Except Jack's Cosmic Hand is now even more powerful than he realized, and it might just be able to stop the inevitable from happening. To get the answers he seeks, he'll need to travel farther...