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One day, Will and Lucy's dad just ... vanishes.They have no idea why he's disappeared until a creepy stranger reveals their dad was keeping a BIG secret. Then there's the second clue: an old diary they find hidden in the walls of their Royal Mile house, with a sinister black dagger on it. Will and Lucy must solve a mystery that's over two hundred years old if they want to find their dad and bring him home. But can they find the answers in time to rescue him?

Sign of the Black Dagger