Lewis: The Gift of Promise (2011)

Andrea De Ritter, founder of an organization that supports gifted children, is murdered after making a presentation to Zoe Suskin, only fifteen but an Oxford student. That night Andrea had resisted the advances of young student Elmo Woodeson as well as sending a copy of the autobiography of former spy mistress Dame Grace Orde to Zoe's publisher father Leon. She had added inside the book "Who Killed Mary? See Chapter 8." Both Leon and Elmo are killed shortly after and Zoe's tutor Donald Voss is poisoned though not fatally. Suskin had punched Liam Cullen, Andrea's lover, wrongly believing he was having an affair with his wife Judith following a text message to her and indeed sexual affairs, with Andrea at their hub, would seem to motivate the killings.