When the Alden children go camping on Blizzard Mountain, a place said to be inhabited by a ghost looking for buried treasure, they begin to think someone or something is trying to scare them off.

On Dead Wednesday, every eighth grader in Amber Springs is assigned the name and identity of a teenager who died a preventable death in the past year. The kids don black shirts and for the whole day everyone in town pretends they're invisible--as if they weren't even there. The adults think it will make them contemplate their mortality. The kids know its a free pass to get away with anything. Worm Tarnauer feels invisible every day, so he's not expecting...

"Rendered a ghost by a bicycle accident, young Finn McAllister teams up with fellow spirit Isabella Rojas to commit invisible pranks on the living, before discovering that they cannot move on to the afterlife"--WorldCat.

"Ophelia Harrison used to live in a small house in the Georgia countryside. But that was before the night in November 1922, and the cruel act that took her home and her father from her. Which was the same night that Ophie learned she can see ghosts. Now Ophie and her mother are living in Pittsburgh with relatives they barely know. In the hopes of earning enough money to get their own place, Mama has gotten Ophie a job as a maid in the same old manor...

While visiting the seaport town of Ragged Cove, Massachusetts, the Alden children find the ship's log of the Flying Cloud, shipwrecked in 1869, supposedly during a mutiny.