Boiled human bones have been found in Norwich’s web of underground tunnels. When Dr Ruth Galloway discovers they were recently buried, DCI Nelson has a murder enquiry on his hands. The boiling might have been just a medieval curiosity – now it suggests a much more sinister purpose. Local academic Martin Kellerman knows all about the tunnels and their history – but can his assertions of cannibalism and ritual killing possibly be true? Elly Griffiths plots as intricately as ever in the ninth of her Ruth Galloway books, cranking up the suspense while maintaining a powerful sense of place and a varied cast of sympathetic and unusual characters. Her regular visits to Ely have become a much -anticipated part of our events calendar, and we are once more looking forward to hearing Elly tell of Ruth’s latest exploits with her customary wit and insight.