Her Royal Spyness

Queen Victoria's great-granddaughter's adventures in 1930s England.

They say her grandmother was Victoria's least favorite daughter (, who married a Scottish nobleman, and their son married first a noblewoman, who died after giving birth to the heir, and Georgiana's brother, and then he married an actress, Georgiana's mother. I like the mother character :-D Even though she isn't especially motherly.
Georgiana is a lady and a second cousin of the crown prince (who would become Edward VIII and abdicate to marry Wallis Simpson).

This is a murder mystery. I have to say I guessed the murderer and the motive pretty quickly, but there were still some twists and secrets that I didn't guess.

She's spying for the queen. (Not Victoria, queen Mary, George V's wife)