In late 19th century Russia, 15-year-old Sacha, an aristocratic girl, dreams of the Arctic adventures of her missing grandfather, Oloukine. Oloukine was a renowned explorer who vanished on an expedition to the North Pole aboard his ship, the Davai. Sacha finds herself at odds with her parents' expectations as they plan her future based on societal norms. Determined to uncover the truth and restore her grandfather's honor, she embarks on her own quest to find the lost vessel, guided by clues left in his old maps and journals. Departing from her comfortable life in St. Petersburg, she faces multiple challenges and harsh conditions.

As her journey progresses, Sacha joins a group of sailors who share her goal, navigating treacherous seas and facing the perilous Arctic climate. Her growth from a sheltered aristocrat to a resourceful and courageous adventurer is vividly portrayed through her interactions with the rugged crew and their struggles against nature. Despite the enormous obstacles and risks, Sacha's determination and bravery drive her forward in her quest for answers about Oloukine and the fate of the Davai. While battling the natural elements and uncovering truths about her family's past, she learns valuable lessons about resilience, courage, and the spirit of exploration.