Lithgow is brilliant in “Bloodline.  Too bad little else is.  Sam Dann’s story follows an unfortunate yet common template for many below-average CBS Radio Mystery Theatre episodes: non-productive and repetitive dialogue in an effort to stretch a 20-minute episode into an hour.  What is unfortunate is that there actually IS a twist in this mystery that might be deduced by the adept listener; however that possibility is muddled by the fact that the same actor is used for multiple roles in many episodes.  Overall the actors put in good performances in a below-par story that ventures into non-believability.  One shining moment in the scattered story lines of a failing stock broker, a dying mother’s confession, an overly demanding boss, a confidence scheme, and a legend tracing its roots to a small European country is Dann’s nifty treatment of a short court scene.  I give the episode only 2 stars out of 5.  “Bloodlineâ€ is worth a one-time listen if you have an hour to spare.  Otherwise move on to stories with a better pedigree.