I read a book a few months/years/lifetimes ago. To be fairly specific about it, without giving away the plot, it's about a scientist and his team that discover how to create and control gravity and change it's orientation. On the night of the discovery, their deaths are faked and they are all kidnapped by a government department that has been controlling the release of advanced technology to the general public for the past 50ish years. They have access to working fusion, cancer cures, advanced AI etc etc.
They give the scientists the choice of joining them or being put in a 'prison' like thing, where they'll stay for x amount of years before being given the choice of joining again. Main character escapes prison and goes on vendetta style thing.