Anne Day has recently lost her father and as he was a Vicar she has lost her home, now she has a chance at being a housekeeper for the Grinsmead famlily in their house Frayle (back when people had multiple servants, including a maid, a cook and a governess). Mrs Grinsmede is somewhat paranoid and convince that someone wants to kill her, which proves prophetic. The first of the locked room deaths; her's could be construed as suicide but Anne has her doubts. When Mr Grinsmede turns up dead in his room, again a locked room mystery it also looks like suicide but something is off to both Anne and when Inspector French becomes involved in the mystery, he's also not sure but he feels a need to ferret out the truth.
Interesting to see how the twists and turns resolve. ( )