If the cold weather is getting you down, “The Lost Valentine,” a film starring Betty White and Jennifer Love Hewitt (CBS, 9/8C) is the perfect reason to stay inside tonight. The film is a collaborative effort between Hallmark Hall of Fame Productions and Paulist Productions, the latter of which celebrated its 50th anniversary in 2010. White plays Caroline, a woman who remains deeply in love with her Navy-pilot husband 65 years after his plane was shot down in the Pacific. Her husband was declared MIA, but each year on their anniversary Caroline returns to the train station where she said goodbye to him and honors his memory. Hewitt plays Susan, an ambitious television reporter assigned to do a human-interest story on Caroline’s devotion. Susan longs to cover more serious stories, but as she gets to know Caroline and her grandson, Lucas (Sean Faris) she realizes that the story may hold more weight than she first thought. In the process, she’s forced to take a look at how much she values the role of love and the meaning of family in her own life. Based on the book, “The Last Valentine,” the film addresses issues of love, loss, family, faith and sacrifice through a sweet yet powerful narrative.