We have known for several decades that a "supermassive dark object" inhabits the centre of the Galaxy, in a compact nebula known as Sgr A*. Every now and then, our satellites detect flares from the vicinity of the object, and there is now strong evidence that Sgr A* was far more active within the last few million years. A great deal is known about the environs of Sgr A* but the true nature of the beast eludes us. Professor Joss Bland-Hawthorn will discuss past, present and future work, including some daring experiments to test the idea of a supermassive black hole.