Nate the Great and the Halloween Hunt

Details:

Nate's good friend Rosamond needs his help. Her cat, Little Hex, is missing. Little Hex hates Halloween, so maybe he's hiding. Or is he lost? Nate and his trusty dog Sludge take the case and hunt in the night for Little Hex. They pass robots, pirates, and witches. But where will they find Little Hex?