Preaching to the Choir by Adrian Tchaikovsky

Elena Mendes thought she understood what “old money” was.

She knew her boyfriend Ross Enderbough was rich. Like, “old money” rich. She knew he was the scion of some eccentric British line that predates the whole United States. She knew he didn’t really get on with his family, and that he fled to America to study free of their influence.

Ross has been summoned to Enderby, the family mansion built as a monastery centuries ago, for an exclusive, mysterious family gathering that happens only once a generation. Spouses and partners aren’t invited, but Ross has asked Elena to come anyway for moral support.

But there are secrets in the mouldering old pile, and terrors in the unkempt woods on the estate. And Elena slowly comes to realise that “old money” means so much more than she’d ever imagined…