Lucretia of Sonenstadt, a court lady, eight times a grandmother and ten times a great-grandmother, as well as a part-time intelligence agent with many years of experience, at the age of seventy was preparing to spend a quiet old age in a family castle, leaving secrets and intrigues to younger people. But all the incredible things happen when you don't expect them. The school of northern wizards is restless: dangerous artifacts disappear from the vault, and under suspicion all students without exception. What should the head of the school do when any magic tricks fail? Of course, turn to a professional. And if the best specialist in intrigue and investigation is an elderly lady of seventy? Wizards love all the best! Age? Not a hindrance! Return the old woman to her seventeen? Easy! So Lady Lucretia's new assignment: foreign country, north, snow, wizarding school and a charming customer full of humour and mystery.