With this dazzling off-beat thriller, his fourth, which appeared in 1962, Mr. Keating had achieved his very top form. Who wanted him? What for? Why was Roger Farrar (if that was his name) on the run in Dublin? Was he a traitor and deserted? The innocent target of a kidnap plot? Or a lonely persecuted paranoiac? In a thriller edged with doubt and menace you never quite know - as you never quite knew with Zen There Was Murder - until the end..