From publisher blurb:
Rats are a serious problem throughout Hârn and Lythia and it is the job of the ratter to control these pests. Vermin of many types inhabit buildings in both town and country and can make life uncomfortable or even dangerous unless skilled ratters are called upon to deal with them. Although pest control is filthy and often dangerous, it is steady work and rat-catching is one of the more lucrative unguilded occupations. Ratters are often from the poorer segments of society. Their unpleasant occupation may make them subject to the contempt of their betters, yet they are nevertheless freemen with a dependable income. A skillful and crafty ratter can earn a considerable sum in ridding a town or manor of its pests and gain a measure of respect from the neighbors.
This article describes the unguilded occupation of ratter and its practitioners' place in Hârnic society.