The Formidable Miss Cassidy: A Novel

""A charming fantasy...Leda Cassidy is something else. An unusual mix of myths and legends from around the world, this feels like a classic-in-waiting."" —The Guardian

A Scottish governess arrives in Singapore to take up her new post, only to find a host of problems await that require her very unique skills in this award-winning and incredibly entertaining historical fantasy novel.

There has never yet been a crisis that Miss Leda Cassidy hasn’t been able to fix, be it a lovelorn young charge, perpetually distracted students, or an unruly and malevolent ghost. When she arrives at her new employer’s home and discovers the family is being terrorized by a vampiric spirit, she sets about righting the situation without delay.

But it seems that as soon as she puts one supernatural creature to rest, another appears to take its place. A woman’s work is truly never done, is it?

When she meets Mr. Kay, a widower whose greatest worry appears to be making matches for his twin daughters, she is happy to take a post that might provide her a bit of respite from her more “spirited” friends. But she soon realizes that the Kays are in far more trouble than she realized—and that her presence in their home might have put the family she’s grown to cherish in even more jeopardy. Will she be able to save them all before it’s too late, or has she finally stumbled upon the one problem she isn’t able to solve?

© 2025 Harper Perennial (Audiobook): 9780063447394

Release date

Audiobook: 16 September 2025