Cooper can't believe that he and Molly are related, let alone twins. They are so different! He loves junk food. She calls it empty calories. He likes to crack jokes. She was born without a sense of humour. He's busy making plans...

Twelve-year-old Flossie Birdwhistle is no ordinary ghost. She's the caretaker of every soul in London's Highgate Cemetery. And during World War II, even the ghosts aren't safe. History collides with the supernatural in this...