An adorable new story in the no.1 bestselling Ten Minutes to Bed series, written specifically to help little ones settle down for bedtime and a perfect book for children with new siblings. All Twinkle wants is to be a big sister. When her wish comes true and there's a surprise at the end of the rainbow, Twinkle must get her new baby brother Fizz back home before bedtime. But with the forest filled with so much magic and adventure, will Twinkle and Fizz manage to get to sleep in time? Weaving a journey from lively beginning to gentle end, this heartwarming bedtime tale is perfect for children with new siblings and will calm sleepy unicorns everywhere!