Imagine the universe as a forest, patrolled by numberless and nameless predators. In this forest, stealth is survival - any civilisation that reveals its location is prey. Earth has. And the others are on the way. The Trisolarian fleet has left their homeworld and will arrive... in four centuries' time. But the sophons, their extra-dimensional emissaries, are already here and have infiltrated human society and and de-railed scientific progress. Only the individual human mind remains immune to the sophons.