Thea Stilton and the lost letters’ is a story book of Russian origin. Thea sisters are in Russia, competing for a figure skating championship. But things take a bad turn when one of their new friends is accused of being a thief and she is barred from entering the championship. She could not compete for the gold medal. A team of five mice resolve to clear her name. Along the way, they discover ancient love letters that could be the key to finding the real culprit. But can they solve the mystery in time? What happens next? The climax is full of surprises and unexpected turns.