Mystery on the Queen Octavia

Sara and her parents get a mysterious letter in the mail stating that they have won a cruise. Sara's mom says "I don't remember entering a sweepstakes for a cruise but I guess we won " Sara says "It must of been that contest I won at school"

Sara goes to the library to find out more about this cruise ship, she hands the letter to the librarian and is surprised when the librarian says "What kind of letter is this ? There is no writing on it. "

When Sara and her family go on this cruise she finds out things she never expected. Ship has ghosts, secret vents that lead to secret rooms, mysterious people, no electronic devices but yet it is a modern ship, no outlets.

The letter states that no electronics are allowed on the ship but Sara sneaks her laptop on board and finds out that the Johnson's went missing along with many other families that have taken this cruise. Will they escape this ship with out being harmed ?