Bartholomew Kettle, unable to save his sister, Hettie when she was pushed into the faery Old Country, promised he would find her but sinister forces are still at work and he must rely on Pikey, who would do almost anything to escape his past, to help find her.
While staying with distant relatives in England, Americans Rowan, Meg, Silly, and James Morgan, with their neighbors Dickie Rhys and Finn Fachan, learn that one of them must fight to the death in the Midsummer War required by the local fairies.
After the Midsummer War ends, Meg Morgan faces a madman in the battle for control of the last bastion of fairies in England, aided by her siblings Rowan, Silly, and James, and American neighbors Dickie Rhys and Finn Fachan.
When Ellie receives a letter from three friends of her dead grandmother requesting that she return to her childhood home, Ellie becomes involved in a fifty-year-old murder mystery that will change her life forever.
After moving from Chicago to Oxford, England, ten-year-old Ellie worries about making new friends at school and caring for her mother who has multiple sclerosis, while also preparing to audition for the resident dancers training program at London's Royal Ballet School.
Pip and her twin brother, Tim, join forces again with Sebastian, the alchemist's son they awakened from a centuries-long slumber, to fight against an evil magician who learns people's deepest secrets in order to control their souls.
While in London visiting her mother, fifteen-year-old Miranda guiltily enjoys the company of a British boy while wondering why her boyfriend is out of touch, but she returns home to find her friendships, love life, family, and math team are all in turmoil.
Tom's American cousin Ben comes to visit him in England, but Tom and his best friend Jeyram ignore him until Ben confronts the school bully and then they become friends.