Home › The Draco Tavern › The Missing MassTThe Missing Mass by Larry Niven· Book 15 of The Draco Tavern Buy on Amazon About “The Missing Mass”The Missing Mass is a book by Larry Niven. It is book 15 of the series The Draco Tavern.← Ssoroghod's PeopleAll The Draco Tavern books in orderThe Convergence of the Old Mind →