The Repository of All Known Knowledge is destroyed, and Grand Master Edgwick Lamplighter languishes in captivity. All the thoughts of his student and companion on long journeys, the first-level librarian Jag, are aimed at saving the teacher. However, as it turns out, we are talking not only about the life of the Grand Master, but also about the fate of the world... The messengers of the dark forces who destroyed the Vault are hunting for the magical Book of Time, for the one who finds and brings together all four of its parts will gain enormous power. And if the aliens win, any knowledge will be turned into evil. Jag and his faithful friends must get ahead of the enemy and make the age-old wisdom contained in the books into the public domain. The task is not easy, but the young dweller is ready to overcome any obstacles.