There are 4 books in the The Lady Diviner series series. The newest book is The Golden Flute which came out in 2022.

1
The Lady Jewel Diviner

Book cover of The Lady Jewel Diviner
Diamonds, Death, and Devonshire tea… in a magical Regency England

Miss Elinor Avely's proper upbringing cannot prepare her for the tiny, spinster vampire who crashes into her sitting room and demands to be fed with a sheep.

Elinor already has enough troubles without having to catch ruminants. First, her secret…
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2
The Moria Pearls

Book cover of The Moria Pearls
A missing necklace, a murder, and an extra helping of plum pie... The magical Moria Pearls are hidden somewhere in Devon, and Miss Elinor Avely and the tiny vampire Miss Zooth are on the case – but a certain washed-up selkie prince is determined to find the powerful necklace before…

3
The Sapphire Library

Book cover of The Sapphire Library
Magics, murder, and mermaid tears…An uncivilised vampiri has stolen the Moria Pearls! Miss Elinor Avely and her tiny companion, Aldreda, are determined to chase the rascal to London – despite warnings to keep Elinor’s Gift a secret, and the perturbing news that a royal advisor is dead. As the ladies…

4
The Golden Flute

Book cover of The Golden Flute

Dangerous island cliffs, a lurking murderer, and a pretence at matrimony...

Pretending to be already married to Lord Beresford is certainly improper, but only if someone discovers it — or so Elinor argues. The honeymoon masquerade will hide their true purpose in travelling to the beautiful island of Sark: to…