It is the latter part of the 21st century, and dramatic climate change has made life in Ireland almost impossible.

Meanwhile, Tir na n'Og is faced with a refugee problem, and the king of the fairies is not happy about it and when it is revealed that the warlord who is behind the problem is a member of the Liddy family, JJ is sent to sort him out... Following on from The New Policeman and The Last of the High Kings, The White Horse Trick travels from the now to far distant futures: from world's end to world's beginning..