First & Only by Dan Abnett

First and Only is the title of a book published by the British author Dan Abnett and set in the fictional futuristic world of Warhammer 40,000. The book is the first of the Gaunt's Ghosts series and revolves around the adventures of Imperial Guard Colonel-Commissar Ibram Gaunt and his regiment, the Tanith First-And-Only, nicknamed the Ghosts because of both their stealth skills and their status as last survivors of a doomed homeworld.