Years after the aliens have been and gone, six landing sites, or Zones, around the world still hold the mysterious remnants of the visitation. These include dangerous but valuable artefacts and, despite the unimaginable terror of these toxic wastelands, stalker Redrick Schuhart feels compelled to keep coming back, his life dominated by the illegal trade in alien products. An unsettling and unforgettable world, the Strugatsky Brothers’ mind-bending novel is a hugely influential twist on a ‘first-contact’ story and was the inspiration for the Andrei Tarkovsky film Stalker.