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I read a YA fiction book aaaages ago that was about a girls' school on an island in... Australia, I think, but I could be wrong. Anyway, everyone except the headmistress and two students (the main character and her best friend, I think) have gone home for the holidays when... I forget, there's an explosion that severs the bridge to the mainland, and the island takes off into the open sea.
It turns out that the whole island was actually a secret weapons project from WWII that everyone forgot about and they eventually built a school on top of it. There's an old man living in a secret base under the island who never got the message that WWII ended, and all this time he's been waiting for the signal that we're about to lose the war, at which point he's meant to drive the floating island to Japan and blow it up (it's packed with explosives) in some harbor or other. And cutting the bridge counted as the signal, so he set the autopilot for Japan and ... I dunno. Anybody recognize this?