Dominoes Level 1: Sherlock Holmes: The Top-Secret Plans

'This telegram is from my brother Mycroft,' said Holmes. 'He wants to speak to me at once about Mr Arthur Cadogan. Do you know this man, Watson?' I saw something about him in today s newspaper, I answered. When a young man dies on a London Underground line, top-secret plans for a new British submarine go missing. But who is Cadogan s killer, why did he die, and where are the missing papers? Sherlock Holmes and Doctor Watson must quickly help Mycroft to answer these important questions.