Bloody Richard?

In a remote English manor house, modern admirers of the much-maligned King Richard III—one of Shakespeare's most extraordinary villains—are gathered for a grand weekend of dress-up and make-believe murder. But the fun ends when the make-believe turns more sinister . . . and deadly. Jacqueline Kirby, an American librarian on hand for the festivities, suddenly finds herself in the center of strange, dark doings . . . and racing to untangle a murderous puzzle before history repeats itself in exceptionally bloody ways.