The Montgomery Manor Murders

This book is about a family of killers, that have been doing it for generations. The only problem is when a detective comes to town, with a chance of ruining it for them. They have to be smart and outmanoeuvre him at every turn.
The detective on the other hand has a secret of his own and this will be revealed. There are many questions that are presented in the book and it will keep you guessing right till the end as to whether they get away with it.