by Arkady and Boris Strugatsky (1972). Compelling SF novel of a visit by aliens to regions called zones, leaving behind a series of strange objetcs and bizarre supernatural phenomena. All that humans can do is to retrieve some of the objects – a very dangerous undertaking done by illegals called Stalkers – and live with the consequences. Strikingly in theme to another Soviet-era SF novel, Lem’s The Invincible, the book embodies the belief that the thought processes of a truly alien civilization can never be understood and will remain forever an enigma.