"A summer in Tarrytown, N.Y., is a lot of fun for ten-year-old Sheila even though her friends make her face up to some self-truths she doesn't want to admit"--Title verso page.

"Harriet Wermer is unhappy about having to spend her summer with her grandmother on Marble island until she discovers a mystery involving her Dad from when he was a boy living on the island"--Title verso page.

Nancy arrives in Phoenix, Arizona, eagerly looking forward to a fun-filled vacation at Shadow Ranch but finds herself embroiled in a baffling mystery involving a phantom horse and buried treasure. Local people believe that the ghostly animal is carrying out the curse of Dirk Valentine, the romantic outlaw who was killed many years ago at Shadow Ranch, where he had gone to fulfill a promise to his sweetheart. Suspecting that a treasure hidden by Valentine...