Few planetary systems have shaped astronomers’ understanding of planet formation as profoundly as Beta Pictoris. Since the discovery of its famous debris disk in 1983, observations with ground- and space-based telescopes, including NASA’s Hubble and James Webb space telescopes, have revealed exocomets, intricate dust structure, giant exoplanets, and evidence of a planetary system still under construction. Now, Webb has uncovered a third giant planet using an entirely new approach: identifying it through the chemical fingerprint of its atmosphere.