Trap Door by Sarah Graves is the tenth book of the Home Repair is Homicide mystery series set in contemporary Maine. Jacobia "Jake" Tiptree and her mariner husband Wade live in an historic 1823 Federal-style home that keeps Jake perpetually busy with home repair. No problem; she learns how to tackle each task - usually the hard way!
Jake vastly prefers her reinvented life in Maine to her former high pressure financial power broker career in Manhattan. Fleeing her former life (and unfaithful neurosurgeon first husband) to Maine with her son was exactly what she needed to bring happiness into her life. With all manner of complications, of course. Jake and her stalwart best friend Ellie face whatever dangers lurk, whether it's Jake's deteriorating roof or sleuthing for a murderer.
This installment of the mystery series has frequent plot twists, many characters and side plots. Jake feels reluctantly compelled to help someone from her past, who tells her he's a hit man target. She allows him to stay in a cabin in the woods, and tries to investigate whatever is going on. A young man apparently commits suicide, but Jake suspects murder. She and Ellie travel into Canada to research his life.
Attempts on both Jake's and her son's lives don't stop Jake and Ellie from sleuthing. Neither do guard dogs. Eventually...Jakes stages a scene which forces a confession (followed by more plot twists than perhaps would be needed?) Victor haunting Jake's house is new and unresolved.
Another side plot is the discovery of a (100-year-old?) book in her cellar, with Jake's name in it. Chapters telling of Jake's adventures alternate with letters between book scholars about the book. That side plot goes nowhere. An obituary of one scholar finishes off the book (without explaining anything).
I like the series - have read them all in order - and will continue, but I don't recommend this one. There are too many loose ends from the side plots, and the main mystery is not compelling.