This 30-minute Peanuts cartoon special concentrates on the antics of Charlie Brown's sister Sally and his dog Snoopy. Sally is stuck for a "show and tell" subject for school. She borrows the nest belonging to Snoopy's bird friend Woodstock, hoping to pass it off as a "prehistoric" bird's nest. When Woodstock reports his missing home to Snoopy, the ever-resourceful beagle transforms himself into a canine version of Sherlock Holmes to locate the thief. It's a Mystery, Charlie Brown was first telecast February 1, 1974. ~ Hal Erickson, Rovi