Spies Like Us by Kathy Ivan

When someone in New Orleans has a problem, Gator Boudreau is Mister Fix-It. Discovering an elderly neighbor has been swindled by a con artist, there’s no question he’ll deal with the situation. Only this time, he needs a little help from the missus.

Wilhelmina McDaniels is pretty sure Gator Boudreau has a few screws loose when he approaches her with a proposal—play his wife while they work a case. Going undercover as Santa and Mrs. Claus at the local Santa’s Village gives them the perfect opportunity to hunt the bad guy.

Catching the conman might be a bit more complicated than they anticipate, since everybody at the local Santa’s Village wears holiday costumes. As they work to uncover the confidence scheme, can they figure out the bad guy’s next move, while finding a little holiday magic of their own?