Pen Rodger is the sister of Lady Helen Clyde. Pen is married to Harry Rodger, a lecturer at Cambridge. Pen enjoyed a very successful career as an art restorer at the Fitzwilliam Museum when she and Harry first married. However, at Harry's insistence, Pen has become a stay-at-home mother. After the twins Christian and Perdita are born, Harry pleads with Pen to have yet another child. Pen acquiesces and gives birth to their third child, an unnamed girl. Over time, Pen has become resentful and depressed at the thought of her husband having a career and a life outside the home while she is saddled with the burden of caring for the children and maintaining the household all by herself. When Lynley consults Pen about Sarah Gordon's paintings, he triggers a spark in Pen that she has not felt in a long time.