The first part of a trilogy dedicated to the struggle of a secret international organization against the machinations of alien ill-wishers. Aliens visit our planet, conduct reconnaissance and abduct people - every year more and more often and more brazenly. To counter them, several leading countries create a secret military-scientific organization "X-UNIT", which must reveal the enemy's goals and disrupt his plans. Ahead of the organization's recruits are battles in all corners of the world, mysterious incidents, scientific discoveries and unexpected intrigues. After all, are you sure that aliens are the true enemy?...Illustration: Roman Malinovsky aka N.K.V.D.