Bob is an independent dog. He knows he could still make it on his own if he had to, even though he now has a home with his human friend Julia, regular meals, belly rubs, and a bed to call his own.

But most important of all, he still gets to visit his best friends at their new home. Ivan, a silverback gorilla, and Ruby, a young elephant, live nearby in a sanctuary.

A home for Bob, a home for his friends, and all the treats he could want—but something’s missing. Someone is missing. Someone who Bob thought was gone, forever. Until the day he realizes she’s not.

A lot can go wrong in the moment left to chance, the blink of an eye, the bounce of a bone, When a hurricane hits, Bob sets out on a dangerous journey in search of his long-lost sister, with the aid of Ivan and Ruby.