Good will to all, and peace on Earth. Even to those trying to kill you.

Adam Donahue lives in the perfect vacation place – Door County, Wisconsin. But his life isn't perfect. His wife was killed by a drunk driver three years ago, and his twelve-year-old daughter has type one diabetes. Now his daughter claims a mythical pooka, in the shape of a giant cat only she can see, is living in her bedroom. It scares him enough to do something he hates – ask for help from his late wife's best friend.

Lauren Finney's insurance agent husband disappeared four and a half years ago. Good riddance. Her Irish wolfhound is better company than he ever was. And she misses her best friend more than the missing husband, though Adam – her best friend 's widower – makes her heart beat faster. Now it's time to initiate divorce proceedings against her husband, before the prenup restrictions expire and he comes back to claim half her considerable assets.

As soon as she starts the proceedings, bad things happen. Very bad things.

Then Adam asks her help with his daughter, and good things happen. Very good things.

It might be their very best Christmas ... or it might be their very last.