James, one of Peter's original Lost Boys, is now working for Scotland Yard and suspects that the heir to England's throne, Prince Albert Edward, is under the influence of shadow creatures who are after starstuff hidden in an underground vault which has only one key: the Sword of Mercy. Molly is determined to help, but when she suddenly goes missing, it's up to her eleven-year-old daughter, Wendy, to keep the starstuff out of the creatures' clutches...

Aidan and Sarah Cooper begin to decipher a mysterious coded document that they discovered in a secret compartment of an antique English desk their father recently bought at an auction, and as they become more involved in the piece, which seems to be referring to the story about the origin of Peter Pan, a powerful being begins to pursue them.