Best-selling Jacqueline Wilson understands perfectly how the needle sharp jealousy of sisters is matched only by the strength of their underlying affection. Marty and Melissa are not in the least little bit like each other; Marty is a tomboy and Melissa is as girlie as a girl can be. What on earth will happen when they have to share a bedroom? What looks like a disaster turns out surprisingly well as the girls learn just how important they are to one another – despite their differences!