Artist's impression of massive star gamma-Cas and its small-but-dense white dwarf companion. New data from XRISM show that the disc of material ejected by gamma-Cas is being consumed by the white dwarf star, generating X-rays. Credit: ESA / Y. Nazé Astronomers have finally identified the source of unusual X-rays coming from the bright star gamma-Cas. The culprit is an unseen companion star that is pulling in material from its larger neighbor. This discovery brings an end to a mystery that has