Check Mate — Caron Allan

Cressida Barker-Powell-Hopkins, reformed society girl, and now devoted wife and mother, is back. In this, the third book of the Friendship can be Murder trilogy. We join Cressida as at first reluctantly then with greater zeal she pours out her heart into her journal, trying to deal with her feelings after the traumatic events of the previous year. Her hit-list is down to just one name. Cressida wants vengeance on the woman who has terrorised her family and almost cost Cressida her life. But her murdering skills are a bit rusty, and her arch-enemy seems to have moved house. What on earth can Cressida do now? Fortunately she knows people who know people.