When Professor Lowell is brutally attacked in his rooms at Walsingham, Oxford, college administrator Anna Hopkins discovers he had a connection with her fellow dogwalker Isadora Salzman - who has been keeping a surprising secret all these years. But someone else knows of Isadora's secret, someone who has sent her a threatening, frightening letter.

When Professor Lowell is brutally attacked in his rooms at Walsingham, Oxford, college administrator Anna Hopkins discovers he had a connection with her fellow dogwalker Isadora Salzman - who has been keeping a surprising secret all these years. But someone else knows of Isadora's secret, someone who has sent her a threatening, frightening letter.