Notes
First published as a serial in Worlds of If magazine in 1968.

Publisher's Blurb
Muller had been sent to spy on the first alien race mankind had ever encountered. But they discovered him, and cursed him with a terrible power that made his presence unbearable to his fellows, theirs to him.

Now, alienated and embittered, he chooses to live out his life in an abandoned city on a long-dead planet. But men must enter Muller's murderous labyrinth and try to lure him out, for humanity still needs his unique talents.

"... an unpretentious but inescapably readable tour de force ... Fantastic, yet basically simple right to the satisfying ending"
Books & Bookmen

"Grips at every turn"
Birmingham Evening Mail

"... a tense and moving story"
Morning Star