Allie is a little concerned when her friends try to set up the Exorcists Club following ion their "ghost-busting" success in Eglantine and Eustace. But when their first customer is Bettina a very plump, shy girl from class, she agrees to let Peter talk her into it. Ater failing to contact Bettins'a cousin who died very young, for her aunt. They discover there is an always hungry spirit living in B's room by doorknocking they find a baby of a drug addict starved to death in her bedroom. Meanwhile Allie's real Dad has suddenly appeared after 8 yrs o/s and A is not sure about him or his motives...