Lurking Beneath (C&C)

From publisher blurb:

In the north, Fort Raigand is the last defence against any invaders that dare to invade through the Dragon's Jaw. But the forts warning beacons have been lit, which can mean only one thing - danger. When the Fort is approached, it is silent. No sounds. No movement. No bodies. The gate is wide open, and from a distance, in the snow, trails of blood leading into the fort are visible. But if the kingdom is in danger, the fort must be investigated. They must find what Lurks Beneath.