From the website:
"Preternatural Horrors Stalk the Land
Something twisted has been unearthed in the Mistwood Mine deep within the Moon Fog Hills. Common folk tremble in terror, whispering of the returning trolls, while others speak of more sinister things. Some rumors speak of the Mathen Family, whose ancient clan is bound to the lands. Are they victims of an ages old curse, or aberrations who walk in the guise of men?
An Aberrant Taint Clings to All
Aberrations is a challenging D20 system adventure for 4-6 characters of 5-8th level. The module contains several areas of adventure, including extensive wilderness locations and a fully detailed manor house. From the mystery of the Mistwood Mine, to the madness of the Carrion Moth Caverns, Aberrations introduces several new monsters and hideous traps to challenge even the hardiest of campaigners. Come and be a guest of the Mathen Estate, just don't plan on staying too long... "