The Christmas Party by Gillian St. Kevern

Tidings of comfort and—ghosts?

As the solitary inhabitant of a notoriously haunted house, Micah Evanovich is braced for another miserable Christmas. He passes his days playing the piano, brooding on his failure to produce a sonata worthy of the woman he loved, and hiding from the world. When a wilful heiress decides his house is the perfect location for her spooky Christmas soiree, Micah’s very existence is threatened. Will the party provide Micah with the chance to put his past behind him—or further cement his failures?
Pippa Goodfellow has five thousand pounds a year and a simple wish: to scare the socks off her infuriatingly superior cousin Julian and his odious friend Bryant. But when her revenge threatens the professional reputation of her beloved Uncle, Pippa needs Micah’s help to ward off disaster. Can an eternal pessimist and hopeless optimist ever find common ground? Or will Pippa’s Christmas Party end in Christmas tragedy for all?