The Prisoner in the Castle

Unlike a lot of other readers, I haven't read any previous Maggie Hope books and this is the eighth in the series, so I came with no knowledge of the character or the previous WWII adventures she'd had. That left me scrambling a bit as I tried to piece together Maggie's relationships with people back in London and how her backstory fit into this one. But that was a minor complaint and really, just left me hungry to read the previous novels.
I love locked-room mysteries (in this case a remote castle on the western slopes of Scotland) so that added to my enjoyment as I tried to figure out who among the eleven British SOE agents sequestered there (because of what they knew) was murdering the others one by one. (and yes, it's similar to Christie's And Then There Were None in that respect). I did find myself questioning early on the premise that the British government would actually imprison valuable agents in the middle of a crucial war, only to find in an author note at the end that yes, this type of facility actually did exist.
The plotting was spot-on, although in the early stages, I had a bit of trouble keeping all the various characters straight. And the settings—both the horrendous weather that keeps help from arriving and provides serious obstacles to Maggie communicating to her possible helpmates, as well as the creepy Scottish castle with its turrets, taxidermy heads, and hidden passages—lent an added layer to the mysterious goings-on. The most enjoyable part of the book was trying to figure out the “who” but the backstory of the previous residents of the castle lent an interesting air of foreboding to the remote setting.
I would definitely read earlier books in the series as Maggie Hope seems to be a resourceful, intelligent, and empathetic character, who reminded me of Maisie Dobbs, one of my favorite heroines. Plus I'm a sucker for WWII stories of female bravery and ingenuity.