A client hired an attorney to represent him in a simple real estate matter. When the attorney asked some standard questions about the financial arrangements for the sale and purchase of the property, the client was somewhat evasive on a few points, but provided the information necessary to complete the legal work for the transaction. The attorney also heard from a friend that the client frequently cavorted with prostitutes. The attorney finds the client rather suspicious and has many unanswered questions, but none surrounding the transaction that occasioned the representation. Does the attorney have an ethical duty to inquire into the affairs of a suspicious client