Pettigrove's is a fine, lucid, carefully-argued book. It exhibits care not only for precision in thought and expression, but also for human well-being: the book is passionate, in an understated way, about the transformative good that forgiving, properly understood, can effect. This means that it is not only those concerned to understand forgiveness who will benefit from reading it, but also those concerned to forgive well, to themselves be good forgivers.