Geoff Dyer introduces his book Zona with a phrase attributed to Albert Camus: “Perhaps, after all, the best way of talking about what you love is to speak of it lightly.” Dyer then goes on to write about Andrei Tarkovsky’s intellectually demanding and spiritually compelling film, “Stalker.” Dyer stays true to his epigraph, speaking of this film so lightly, that he glides over the surface and does not enter the movie’s depths. What results is far from an intellectually demanding book; it is like cautiously soaking one’s feet in the pool rather than jumping inside and feeling the full sensation.