Milo and his best friends Ophelia, Ella and Theo are on their way to London for a study visit at the Royal Collection Trust and to explore the streets of the capitol. But at the museum Milo finds a diary on the floor, completely empty of words. As the evening creeps up, words are being written in the diary and suddenly the four friends are magically transported to a time of revolution, war and a family in danger in Russia 1917. Milo appears in the court, and his friends turn up outside of the Alexander Palace. If the four friends are ever going to get home again they need to find each other and the one who wrote the diary, but will they?