Twelve-year-old Vanya discovers an old pocket watch in his grandfather's attic—only to realize that it ticks backward. When he turns its dial, he is transported to the past, where he meets his own mother as a child and explores a world without modern technology. But time travel isn't as simple as it seems. With each tick of the mysterious watch, Vanya risks getting stuck in history forever. Can he uncover the secret of the watch before time runs out?