In the nineteenth century, we find Lydia Carlton living in Scotland, making a living as a fairy doctor. She is one of those rare humans who can see and communicate with fairies. But no one believes her. However, Edgar is in need of someone with a vast knowledge of fairy lore, and Lydia is just that person. After rescuing her, he becomes her employer, but there are many secrets and emotions that seem to follow Edgar, who claims to be the Blue Knight's Earl.

Edgar Ashenbert claims to be descended from the human ruler of the fairy kingdom, and he urgently needs Lydia’s help to find and claim his birthright, the legendary sword of the Blue Knight Earl. Things will never be the same for Lydia as she is pulled into a dangerous quest against dark forces!
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(Source: Shojo Beat)

Lydia Carlton is a fairy doctor who can see and communicate with fairies. When she embarks on a journey overseas to visit her father in London, she’s kidnapped by a young man named Edgar Ashenbert who introduces himself as an earl and requests Lydia’s aid in searching for a treasured sword that will prove his status. Although she finds his story dubious, Lydia agrees to work with him—if only because he’s her first real client. Meanwhile, rumors of a heinous burglary abound, and the culprit seems to bear an uncanny resemblance to Edgar...
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(Source: J-Novel Club)

Tomkins