Ryck sets another round of Euro-Soviet spies clicking on their circular track, and again his unique, caustically avuncular distance achieves a subtly escalating interplay of actions and ironies. This time the central impossibility -- the snatch of a Soviet physicist while he swims under guard in serene Black Sea waters -- piles up eight deaths, sends double agents into double-time activity, involves marathon surgery and hypnosuggestion in a subterranean vault, and ends in a blaze of surprises Ryck holds off commenting on the ""bizarre"" profession and the powers it serves, but his lightly acidulous overview adds that extra X to the XX.