A teenage boy is talking to his father in the library of their rambling Irish house. His father tells him to look at a particular picture; the moment he obeys, four armed men enter the room. But when he turns round, his father has vanished – apparently into thin air. So, in brilliantly dramatic fashion, begins Lord Dunsany’s The Curse of the Wise Woman (1933). As a novel it defies categorization, but if you imagine a John Buchan thriller with an overlay of the Celtic Twilight and Rachel Carson-style eco-prophecy you will be almost there.