We should know each other for a reasonable time...Lisa (shaking her head): But lieutenant, I""m sorry.It""s impossible.Lieutenant: Impossible?Lisa (nervously and with some agitation): Please don""t ask me to explain, but.The tenant is a conservative, strict law-and-order, Dean of Commonwealth Law School and legal scholar, Professor Michael Lightcap (Ronald Colman), who is being considered for a Supreme Court appointment.A 4:30 pm appointment had already been scheduled that same afternoon between Dr.Cukrowicz and Mrs.Venable in her luxurious, Byzantine mansion-estate in the French Quarter - their meeting was considered to be "a matter of some urgency.Rick hides the two priceless letters of transit for him, secretly stashing them in the club""s upright piano while Sam sings and plays: "Who""s Got Trouble? - Knock on Wood" - the song itle provides commentary that is pregnant with meaning.