In her first non-Gunsmoke appearance in two decades, Amanda Blake plays Helen Mercer, a lonely, middle-aged widow. Helen hires the deceptively sweet Adele Murphy (Tisha Sterling) as her companion. What she doesn't know (but we do, thanks to a rather violent prologue) is that "Adele" is really an extortionist named Gretchen, in league with her homicidal con-artist boyfriend Jay (Sam Groom). Singing star Dick Haymes makes his TV movie debut in the third-billed role of Harold Porter. Based on a novel by suspense specialist Doris Miles Disney, the made-for-TV Betrayal premiered December 3, 1974. ~ Hal Erickson, Rovi