A talented 17th-century craftsman from the German city of Nuremberg made an amazing mechanical toy for a wealthy Eastern merchant - a golden carousel with a secret. After this, the customer mysteriously disappeared along with the toy, but the master managed to make a copy... These days, the young artist Katya returned to the house where she lived as a child. Her longtime friend persuaded her to participate in a local exhibition with the painting “House with a Tower.” But suddenly strange things began to happen. Her painting disappears, and strangers come to visit the artist. Katya finds herself drawn into a dangerous story, which mysteriously turns out to be connected with a lost artifact...