That's lousy Liz. Your customer should understand you're in the country, and at least you're dealing with it. The wall around our fireplace is an annual problem when the weather gets bad. We can hear them (rats) in the wall, but they come and go from under the house. Once in a while one will venture into the house from some opening, but our cat gets them. Otherwise, we set traps outside. I use the glue traps in some places, even though they're probably less humane. One year we had a family in the wall and I but out a glue trap near where I thought they entered outside. I think it must have been the kids first trip out of the house, but I came out one morning and there were 5 juvies all stuck to the same trap. Mom probably knew to avoid it.