This is enjoyable light reading for when you need something fun, frivolous and frothy.
There's nothing in the slightest bit challenging here, and some very familiar plots and characters: the upper-class `gel' who needs to work and earn her own money (cf. Daisy Dalrymple); the actress mother who `bolts' from all her marriages (cf. The Bolter in Nancy Mitford's books); the inane upper-class men who can't pronounce their `Rs' (`mawwy me'), can't dance without stepping on their partner's toes, and so on.
Added into this mix is what feels like a sop to an American readership which takes our heroine into Buckingham Palace to have tea with the queen, and some rather unkind bitching about Wallis Simpson. Oh, and of course a murder which only our heroine can solve.
Bowen pulls the whole thing together with huge enjoyment despite the gaping flaws - a murderer who carries cyanide around in his pocket on the off-chance he'll get to use it; a heroine who doesn't have a faintest idea how to make black coffee but makes a living cleaning other people's houses (including the toilet!).
If you enjoy cosy, light-hearted books like the Daisy Dalrymple or Agatha Raisin series then this may be a good choice - perfect switch-your-brain-off reading.