I read this book to fulfill the goal read a locked room mystery. The "locked-room" or "impossible crime" mystery is a subgenre of detective fiction in which a crime (almost always murder) is committed in circumstances under which it was seemingly impossible for the perpetrator to commit the crime or evade detection in the course of getting in and out of the crime scene. I always enjoy a good Agatha Christie. I was a bit perturbed when i thought the book was over and still no one really knew who did it. i thought it was going to leave a lot of loose messy ends. however after the epilogue is a nice chapter summing up and explaining everything. I recommend it.