Robert Pärg needs to go military service for 11 months. There will wait him new missions and meets a old friend, who wants to show for everybody, who Robert really is.

Military service has barely begun, but the conscripts are already faced with all sorts of temptations: Robert is eagerly immersed in the problems of his civilian life, Kristo discovers the charms of the infirmary, and Rait is excited about the newly arrived female group of the battalion.

It's visiting day at the battalion, and privates Mesine and Ilus try to outdo each other in telling Ilus' parents about the strange events that have recently taken place. They and their group discovered something in their room that should not be there under any circumstances.

Robert is convinced that he has discovered the root of all evil in the battalion. During the first longer forest camp, he sets out to convince the others of his suspicions, but it proves to be anything but an easy task.

Youth is coming to an end, with only the final big jorney ahead. Robert's fight with the mysterious enemy has reached a climax - at least for him, but his teammates are starting to feel that Robert is crossing a dangerous line that could cause trouble for the whole group.