This is an interesting series. More novella-in length than a full book but that keeps it quick and interesting. I'm hoping we see more character development as the books go along. 
In this book, a manor house burns down, but our intrepid somewhat amateur detectives Jack and Sarah (only somewhat since Jack is former NYPD) are suspicious about it's causes. The two are going to team up to see about a few things including what was hidden on the floor that the manor's owner was found dead on, in a room he forbade anyone from entering. They will also figure out why the owner's children, none of whom seem like particularly nice people were cut out of his will.