Monika and Dawid are going to share a friendship but also a common secret. They’re going to discover a world inhabited by creatures that devour Mondays, Tuesdays and other days of the week. Will they manage to make their dream come true and go back in time? They’re going to find out the mystery of the old clock and wake up the Time Runner. They’re also going to face the evil witch who steals precious memories from kids. A tale about longing, love and imagination so powerful that the impossible is made possible, forever changing the life of all protagonists.