From the dreaming spires of Oxford, Lewis Gillies drives north to seek a mythical creature in a misty glen in Scotland. Expecting little more than a weekend diversion, Lewis finds himself in a mystical place where two worlds meet, in the time-between-times - and in the heart of a battle between good and evil.

The ancient Celts admitted no separation between this world and the Otherworld: the two were delicately interwoven, each dependent on the other. The Paradise War crosses the thin places between this world and that, as Lewis Gillies comes face-to-face with an ancient mystery - and a cosmic catastrophe in the making.