Amy Fisher: Jo’s younger sister; she goes to a different school from Jo
Merlin: Jo’s dog; he’s a German Shepherd dog and is very intelligent
Mikey: a friend of Jo’s; he’s a year older than Jo and goes to the same school as her
Sean: a nineteen-year-old boy that Jo meets
Gus: a man from Newcastle in the northeast of England
Sam: Amy’s best friend; he lives in the house next door