It's a Mystery, Charlie Brown

One day Woodstock finds his nest missing, and Snoopy, donned in a Sherlock Holmes outfit, visits all the kids' homes to investigate. It's eventually found, and Lucy, dressed as a judge in her psychiatric booth, presides over a "trial" between Woodstock and the perpetrator over its ownership. Cute, mostly well-paced, video. Quaint background art. Pleasant Vince Guaraldi jazz soundtrack. On the minus side the "trial" sort of lags, and the voices in the video are somewhat flat, especially that of Peppermint Patty, who actually sounds middle-aged.

Though this is from the 1970s, it's not very dated in its humor or artwork. I'm surprised it hasn't aired regularly on TV. It has the qualities of a classic Charlie Brown special.