X marks the spot. At least in fiction. That's what ten-year old Colin "Smout" McManus always thought, but when a mysterious package arrives at Edinburgh Academy from his archaeologist uncle, Smout finds himself embarking on a dangerous adventure throughout the streets of historical Edinburgh to find a lost pirate treasure. Smout and his ragtag group of friends must solve a series of strange clues and riddles to puzzle out the mysterious trail. But they're not the only ones in search of the gold. Someone as ruthless as the pirates of old is hot on their heels. Will they find the treasure before he finds them?