Laidlaw knew him in his laboratory, was one man; but Mark Ebor, as he sometimes saw him after work was over, with rapt eyes and ecstatic face, discussing the possibilities of "union with God" and the future of the human race, was quite another. "I have always held, as you know," he was saying one evening as he sat in the little study beyond the laboratory with his assistant and intimate, "that Vision should play a large part in the life of the awakened man-not to be regarded as infallible, of course, but to be observed and made use of as a guide-post to possibilities-" "I am aware of your peculiar views, sir," the young doctor put in deferentially, yet with a certain impatience.

    Highly sceptical, naturally, the Old Dealmaker negotiates a trial period - a summer holiday in a human body, with all the delights of the flesh.The body, however, turns out to be that of Declan Gunn, a depressed writer living in Clerkenwell, interrupted in his bath mid-suicide. Ever the opportunist, and with his main scheme bubbling in the background, Luce takes the chance to tap out a few thoughts - to straighten the biblical record, to celebrate his favourite achievements, to let us know just what it's like being him. Neither living nor explaining turns out to be as easy as it looks. Beset by distractions, miscalculations and all the natural shocks that flesh is heir to, the Father of Lies slowly begins to learn what it's like being us.