Like most 'between the numbers' Stephanie Plum books, this one was just a bit on the dull side.
Stephanie finds herself in Atlantic City chasing after Grandma Mazur who has found a duffel bag full of cash and is spending it like there is no tomorrow. Stephanie is not the only one chasing after Grandma. Snuggy O'Connor, a little person who thinks he is a leprechaun, is also after the duffel bag and Diesel is after Snuggy.
It seem Mr. Leprechaun stole the money from a local mobster to pay for the surgery that would save his horse's life, but on his getaway lost the money (which is how Grandma Mazur has it). It seems Mr. Mobster is not the giving type so he is after the whole bunch of them, taking said horse hostage until he gets his money back. This is how they all end up trying to come up with a plan to rescue a horse that is being held for ransom.
It's a hodge pod of characters who don't really go together and the story was asking too much of us. It was nice visiting with the team again but I was not impressed and was disappointed.