The stunning new book from Costa Novel Award-winning novelist O’Farrell Instructions For A Heatwave is a mystery portrait of an Irish family in crisis in the legendary heatwave of 1976. Thomson’s Secrecy is set in Florence in 1691. It is a love story, a murder mystery, a portrait of a famous city in an age of austerity, an exercise in concealment and revelation, but above all it is a trapdoor narrative, one story dropping unexpectedly into another.