Lighthearted Mystery

 Twisted Twenty-Six by Janet Evanovich 

This had the signature humor that you expect from a Stephanie Plum novel, but it also had some existential dread that is new. The book starts with Grandma getting married and her new husband immediately dropping dead. Except he was in the mob and he was the keeper of the keys so now everyone in town is after Grandma. Stephanie has to do her job of rounding up people that skip on their bonds while also watching out for Grandma. Grandma ends up getting kidnapped at a bake sale and it's not anybody that they expected; it's the son in law of the dead guys first wife and neither his wife nor the first wife had any idea. Well, he was hired by two of the dead guys friends and instead of paying him off, they kill him because they're the mob. They're about to start working on Stephanie and Grandma, but they don't have any gas for the blowtorch so off to Home Depot they go. Stephanie is able to find the keys to the chains on the dead guy and get them out and they steal a concrete truck. Morelli and Ranger have called in literally everyone and the traffic chopper finds them first so all the cops converge on them. Grandma is returned home safely, still no idea where the keys are. The next day, the one remaining mob guy who didn't participate in the kidnapping sends Grandma a present, her dead husbands chair from the club. Dad is excited because it's a good chair, only thing is the seat cushion needs to be flipped and lo and behold, there are the keys. That's where the book ends, with Stephanie agreeing with Grandma that they will figure out what the keys open and what the treasure is. Normally these books have a neat and tidy ending, but this one is going to roll over into the next book. That's new and with how long this series has been going on, connecting the books isn't a bad idea.