Albireo (beta Cygni) is a well-known multiple-star system visible with the naked eye from the Northern hemisphere. Proper-motion measurements from Gaia DR2 and DR3, combined with archival Hipparcos data, as well as with spectroscopic radial-velocity measurements and speckle interferometry, indicate a severe discrepancy between the light and mass of component star Ac. This discrepancy has now been confirmed independently via a direct measurement of the gravitational acceleration experienced by the brightest component star, Albireo Aa. The "missing" mass is of the order of 3 Msun. Follow-up campaigns are thus ramping up.