Set in the Irish Midlands in the 1850s, Emma Donoghue's The Wonder - inspired by numerous European and North American cases of 'fasting girls' between the sixteenth century and the twentieth - is a psychological thriller about a child's murder threatening to happen in slow motion before our eyes. Pitting all the seductions of fundamentalism against sense and love, it is a searing examination of what nourishes us, body and soul.