Now that he's reached his age of maturity, otter shifter Noah is ready for his migration, where he'll travel down the Pacific coast in search of a new place to call home and hopefully find his mate. He has only barely begun when he comes across Herm, another otter, who has his paw tangled up in a wire. He's hurt and they need help, so Noah calls his cousin. With Denali's help, Noah and Herm are put up in an empty house while Herm heals up enough to continue on his way.
But the waters aren't safe for otters, not with a couple of rogue orcas making trouble for them, and as the disappearances increase, Noah realizes they're all in danger. He's sure that Herm is his mate, whether the grumpy old otter wants to admit it or not, and Noah knows he must do anything to protect them both, especially when trouble decides to invite itself in.