The gang is back together! With their newest member Nairobi, another female sabertooth that they rescued from the notorious Captain Gutt. With the two new additions, Shira and Nairobi, they figure out that Nairobi is Diego's long lost sister from the years past. For the past year, everyone becomes preoccupied with thoughts. Diego and Shira get married and think about parenthood, Peaches and her fiance Julian are thinking about leaving the pack behind when they get married. While Sid and Nairobi are still single, both worry that they won't find love in the world.
To make things worse, a giant asteroid comes to destroy their little home Earth. The gang must put aside their thoughts for the future and stick together. They reunite with Buck, who leads them along the way. But he has worries of his own...
The newfound member, doesn't exactly have the most pleasant reactions when Buck comes along. But when Nairobi and the adventurous weasel grow closer, and possibly grow feelings for one another, the pair learn that the best way to survive is by being together.
Experience heartache, betrayal, love, loss, grief, sadness, family and adventure in one book. Find out if Buck, Nairobi, Eddie, Crash, Ellie, Manny, Peaches, Diego, Shira and Julian have what it takes to survive,
And if they stay together, for survival.