The Haunting of Calrow Ruins

From the introduction:

Gibberlings infest Calrow Ruins. When the mists blow in off the shores of Lach Gwyren, snaking through crumbling arches and shattered barbicans, the gibberlings’ terrible wailing can be heard for miles. These leering, furry abominations are spawned from captives by an ancient brood mother lurking beneath the ruins. Once imprisoned in a magic tapestry deep within the keep, the brood mother is close to finally escaping thanks to the meddling of a vengeful lady-inwaiting. Amidst a noble feud to reclaim the ruins, the characters are faced with solving the mystery of the gibberlings.

User summary:

For four to five characters of grade 5.