Four school friends - Karolis the successful but cuckolded businessman, Šampūnas the womanizing ad director, Tankas the tough but lovesick officer, and Princas the struggling father of three - reunite at a class reunion and, determined to change their lives, wager on increasingly outrageous dares. From streaking naked through their office, military drills, a reunion with an ex, and even a kindergarten, to spending a whole day speaking only the truth, they push each other’s limits, testing not only their courage but the strength of their friendship.

Curious citizen Žygymantas, during an excursion in the dungeons, stumbles upon the relic hunter Teisutis, who has just unearthed a chest that should contain the treasure he was looking for so long ago. It turns out that there is no treasure in the chest, only a medallion with a strange inscription. Žygymantas helps Teisučius solve the riddle and unexpectedly summons the ghost of Barbora Radvilaitė. It turns out that Barbora's appearance may lead them to the Great Treasure of Lithuania, hidden in the dungeons of Mount Gediminas. Here begins an unpredictable and exciting journey full of adventure and laughter, where different characters get involved one after the other, also to find the mysterious treasure. But as they get closer to their destination, everyone sees something that no one could have expected...