The Mystery of Yew Tree House

The Mystery of Yew Tree House is book 9 of a series. I haven't read any of the preceding books, but this didn't matter as each book can be read as a standalone.
Jack and Stella are the series protagonists. Jack is a train driver, Stella owns a cleaning company. In their spare time the pair solve old murder mysteries.
The Mystery of Yew Tree House is set across two timelines, the present, and the period 1940-45. There's a lot going on in both timelines, and it can be difficult to keep track of who did what. Stella is given to a lot of internal musings and monologues, which become annoying as the story unfolds.
It's an interesting tale, but I must admit I preferred the 1940's timeline as the characters are more interesting and there is more action.
If you like cosy mysteries you'll enjoy this one.