When one of their number disappears on the same day that an American girl joins their ranks, a group of English boarding school students embarks on solving a mystery.When one of their number disappears on the same day that an American girl joins their ranks, a group of English boarding school students embarks on solving a mystery.When one of their number disappears on the same day that an American girl joins their ranks, a group of English boarding school students embarks on solving a mystery.