A Snowflake at Midnight - Anne Renwick

A rare manuscript. A midnight promise. A villain who would steal them both away.
Pressured by looming deadlines and an annoying patron, Evie Brown, academic librarian, struggles to find joy this Christmas holiday. Worse, her sick father is ready to abandon treatments and surrender to fate - a decision she refuses to accept. Delving into a medieval manuscript, she searches for answers in the distant past.
For the woman who has stolen his heart, only a perfect proposal will do. Ash Lockwood, botanist, has transformed the rooftop greenhouse into a tropical fairyland. But when Evie begs him to help her harvest mistletoe at midnight, they venture down a different garden path - unaware that danger circles close.
When their plans implode and a murderer threatens their lives, only invention and teamwork will save them.