Intelligent beings with an indigo aura. The only ones who are able to activate “beacons” are portals left over from an ancient race that left our Galaxy a long time ago. There are very, very few carriers of indigo aura. For each of them, it doesn’t matter, a humanoid or not, the most powerful of space civilizations - the Free Federation and the Kraig Alliance - are waging a real war. But one day the warring “aliens” become aware: on the small, backward planet Earth there are many “indigos”. The Earthlings are clearly not rivals to either the Kraigs or the federates. But if the Free Federation intends to come into contact with earthlings and conclude a friendly alliance with them, then the warlike Kraigs simply intend to conquer our planet and turn people into slaves - living keys for the “lighthouses”...