It's a Mystery, Charlie Brown is the 11th prime-time animated television special based upon the popular comic strip Peanuts, by Charles M. Schulz. It was originally aired on the CBS network on February 1, 1974. This was the first Charlie Brown television special that Bill Melendez did not direct, but he still served as producer and provided the voices of Snoopy and Woodstock. Summary While building a nest on his tree, Woodstock has trouble keeping the straw for it together; and it falls apart and causes Woodstock and all the straw to fall to the ground. After a few unsuccessful attempts, Woodstock finally ties the straw together in a unique manner which makes it safe and secure. Meanwhile, Sally vents her frustration to Charlie Brown over being assigned another science project. Woodstock's nest disappears the next afternoon, so he turns to Snoopy for help. Adopting the guise of Sherlock Holmes, Snoopy and Woodstock go on the hunt for the missing nest. Most of the places they check include: Charlie Brown's house, where they wake him up and give him the third degree. He naturally denies anything about taking the nest. Lucy and Linus' house, using an excessive amount of dust to check for fingerprints. Snoopy eventually finds a broom straw and believes this is enough evidence to make Lucy a suspect. He tries to handcuff her, but she throws him out of the house. Marcie's house, where Snoopy pulls out his notepad and questions her on the whereabouts of the nest. She is unable to understand Snoopy in his dog language and slams the door in his face. Pig-Pen's house, where Snoopy immediately dismisses him as a suspect once he answers the door in his usual dusty trademark fashion entrance. As Snoopy takes off, Pig-Pen tells him to come back anytime because he does not get many visitors. Finally, the home of Peppermint Patty, who thinks Snoopy is playing Cops and Robbers, so she dons a burglar mask and chases him through her house. Frightened, Snoopy and Woodstock escape. Upon stopping back at Woodstock's tree, Snoopy takes more notice of a set of footprints he had seen before; they lead away from Woodstock's tree, so the two follow them straight to the elementary school. After making their way inside through an open window, they ultimately find Woodstock's nest under glass in a display case. The two grab the nest and