The Grey Lady of the Manor by Elizabeth Keysian

When the magic of love becomes something darker…The night hides more than just May Day revels.
Deep in the Essex countryside, the Grey Lady of Patience Bridge lures unwary travelers to their deaths. At nearby Temple Roding manor, superstitious maidservant Letty believes herself cursed, and is desperate for help. The irrepressible Perkin is secretly enlisted to quell her fears but he soon discovers that something unearthly is stalking Letty. Why has it picked on this innocent young beauty, and could the haunting be connected with the Grey Lady’s tragedy?
To free herself, Letty hazards everything in a daring gamble, and the smitten Perkin agrees to help. But if her plan fails, it won’t just be the dead who are determined to take their revenge on the pair, but the living as well.
And the living can be far more dangerous.
(Note: This story was first published as part of the USA Today Bestselling Boxed set Upon a Midnight Dreary, October 2021)