Mark Tidd's Citadel

"Mark Tidd's Citadel" by Clarence Budington Kelland is an adventure story about a group of friends whose summer vacation plans take an unexpected turn when their destination turns out to be abandoned. Undeterred, Mark Tidd and his companions embark on a journey beyond relaxation as they take on the challenge of renting and running the neglected hotel themselves. As they navigate the trials of unexpected ownership, they find themselves caught in a web of mystery when they encounter a Japanese boy named Motu and suspect the boy is running from dangerous people, compelling them to become his protectors.