When Rebecca's slumber party invitations disappear, Nancy promises to try to find out who took them and why.

"Olivia Grace Clarisse Mignonette Harrison should be having fun. Her best friend is visiting from America, her sister's royal coronation is only three days away (the first coronation of a female ruler in two centuries), and she's even got a new boyfriend who is actually a very smart and charming prince. But it's hard to celebrate when her royal cousins are scheming to take over the throne"--Dust jacket flap.