During a tour of the dungeons, the curious citizen Žygimantas stumbles upon Teisutis, a relic hunter who has just unearthed a chest that is supposed to contain the treasure he has been searching for so long. It turns out that there is no treasure in the chest, only a locket with a strange clue. Žygimantas helps Teisutis to solve the riddle and unexpectedly summons the ghost of Barbora Radvilaitė. It turns out that Barbora's appearance may lead them to the treasure of the Great Treasure of Lithuania, hidden in the dungeons of Gediminas Hill. Here begins an unpredictable and thrilling journey full of adventure and laughter, in which one by one the different characters get involved in order to find the mysterious treasure. But as they get closer to the goal, they all see what no one could have expected...