Inspector Paws, a battle-scarred alley cat, is dismayed when his caretaker, Stella Clayton, decides to take a cruise despite threats from her best friend's soon-to-be husband. Jo plans to marry the despicable Leroy Garvey onboard, but Leroy makes it clear he wants Stella nowhere near. After all, as he tells her, "Accidents can happen at sea."
In an effort to protect Stella, Paws sneaks onboard The Spirit of the North, bound for Alaska. Before he can find her, the ship sets sail, and Paws is now a feline stowaway! Soon, he's caught and tossed into Captain Bonar's brig with little hope of protecting his owner and her equally headstrong granddaughter, Max.
He's lucky to escape just as a murder ensues in the ship's Neptune's Loft. Stella and Max are all too happy to stick their noses into the investigation, but haven't they heard curiosity killed the cat? It's up to Paws to find the guilty party, while keeping his humans safe aboard a mad ship where anything can happen.