In June 1907, twelve-year-old Samantha looks forward to a happy summer with Nellie and her younger sisters at Grandmary's country home in the Adirondacks but a series of mysterious accidents on the property lead Samantha to suspect that someone is deliberately causing trouble.

When Ted and Kat's cousin Salim disappears from the London Eye ferris wheel, the two siblings must work together--Ted with his brain that is "wired differently" and impatient Kat--to try to solve the mystery of what happened to Salim.