Jillian Harker ; illustrated by Ann Johns. Gillian Cross ; illustrated by Tim Stevens. illustrated by Ann Johns. written by Jillian Harker ; illustrated by Pamela Venus. by Ali Sparkes ; illustrated by Ross Collins. written by Jillian Harker ; illustrated by Kristina Stephenson. written by Jillian Harker ; illustrated by Louise Gardner. illustrated by Ann Johns written by Jillian Harker ; illustrated by Caroline Pedler. Jill Paton Walsh ; illustrated by Jolyne Knox.