Journey to the Buried Vale

From the introduction: With the snows of winter receding, the scouts of Citadel Hoarfrost have spotted an unexplored cave nearby in the Buried Vale. As their first assignment, a group of young dwarven adventurers has been selected to journey to the vale and delve the recent discovery. But is their assignment all that it seems, and what dangers await them in the Buried Vale? A 2-hour adventure for five 1st level dwarven characters