Based on the limited amount of information that you provided, it isn't clear what court would have jurisdiction. Is the real property located in Idaho? I would strongly advise that you speak with an experienced attorney who deals specifically in this area of law to get specific advice.
Tyler S. Rounds
Lovan Roker & Rounds, P.C.
717 S. Kimball, Suite 200
Caldwell ID 83605
To sue for a wrongful lis pendens, you'd sue where the property is, but there's undoubtedly more to this story, including the presence of whatever other litigation is pending, as well as other contracts between you (or your business) and these 2 people, so you'd really need to have all your documents reviewed by a lawyer before the proper court (and other issues) could be identified.
Disclaimer: I'm only licensed in CA. Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.