Where did you see the listing? If it is a Realty Trac listing it is probably not on the market and thus no one can give you information other than the owner. Realty Trac purlishes "pre-foreclousre' lists. The owners of these homes are in default on their mortgages and the banks have begun the foreclosure process, however, the owners are still the owners and only THEY can sell t he property until the bank actually forecloses and owns the home. I know it's frustrating and confusing but that's how it is. Unless the home is listed through a realtor you will have to go directly to the owner, which is extremely difficult, most won't even talk to you.
Hope that helps.