Anya’s Ghost is a graphic novel about a ghost with a mischievous streak who’s more dangerous than she lets on. Moo is a contemporary story in which two city-bred kids who are transplanted to a small town are hired by a neighbor lady to take care of her temperamental cow. And the series continues with Charlie Bone and the Time Twister. Nimmo is good at layering on new complexities. A solid MG series.