The Door to Time audio book adaptation, read in Russian by Vladimir Levashev, is the first book in the Ulysses Moore series set in a village with several Doors of Time spread around, and each door requiring its own unique key to open it. Once opened, it leads to a distant time and space specific to that door and it can only be reopened when all of the travellers who passed through it return. The only exception is the Door of Time inside the Argo Mansion, which can take the traveller to any place he or she wants, as opposed to the fixed locations the other Doors offer. However, four keys are needed to open that one, making it the most difficult door to access. This particular door leads to a cave where there is a lake and a boat called Metis used to take the Travellers to their destinations.