[1] When Nancy and her chums, Bess and George, sign up for a bicycle tour around Ireland they don't expect to be thrust into mystery mode.
However, several of the other participants in the tour raise Nancy's suspicions: a dark character who lacks one pinky, an eager-beaver journalist, and two mysterious girls from Australia.
Nancy unravels the truth about Rhonda and Rachel but finds herself in a race against time to save them from danger.
The 19th installment in the Nancy Drew point-and-click adventure game series by Her Interactive, named Nancy Drew: The Haunting of Castle Malloy, is loosely based on the novel.
This article about a mystery novel for children first published in the 2000s is a stub.