In this first episode of Baretta's second season, undercover cop Tony Baretta (Robert Blake) goes after heroin dealers who are trafficking in a very pure, and very lethal, grade of the addictive drug. Singer-composer Paul Williams, who co-wrote the script, guest stars as a music emporium owner who sidelines as a dope pusher -- and who is unwittingly doling out the deadly "horse." Edward Grover joins the cast as Lt. Hal Brubaker. ~ Hal Erickson, Rovi