Mo Appleby's ordered life is turned upside down when he and his mum move in with his new stepdad and stepsisters, Lottie and Sadie. The home he left behind is just across the street, and there's something not quite right about the new occupant. Other strange new people keep popping into his life, too: a bonkers lollipop man and a boy called Jax, who seems to understand Mo better than anyone else, especially Lottie. Who are the weird new people in their town? Do they have any involvement in the disappearance of Mo's dad many years ago? And why does the ice cream taste so good? Lottie is determined to find out exactly what's going on, even if it makes Mo mad, and even if it leads them both into serious danger...