"A Lesson in Vengeance" is a young adult novel written by Victoria Lee, an American author known for her works in the fantasy and LGBTQ+ genres. The book was published in August 2021 and gained attention for its dark and atmospheric storytelling.

The story is set in an exclusive all-girls' boarding school called the Dalloway School, known for its eerie and haunted history. The protagonist, Felicity Morrow, returns to Dalloway after a year away, hoping to leave her tragic past behind and focus on her studies. However, she is soon drawn into a complex web of secrets and mysteries surrounding the school's history, including tales of witchcraft and a student named Alex, who died under mysterious circumstances.

As Felicity becomes involved in uncovering the truth about Alex and the school's past, the book delves into themes of obsession, love, power, and the blurred line between reality and fiction. It also explores LGBTQ+ themes, as Felicity grapples with her own feelings and desires, and her relationship with another girl named Ellis.

"A Lesson in Vengeance" has been both praised and criticized for its dark and Gothic atmosphere, intricate plot, and complex characters. Some readers appreciate its exploration of LGBTQ+ themes and its unique take on the boarding school mystery genre. Others have found it to be challenging due to its themes and narrative style.