Finders Keepers — Scott Pearson

Cpl. M. J. Robeson of the United Earth Systems Marines comes to in her quarters aboard the starship Alliance and discovers that she is the only member of the crew conscious while a lone unidentified intruder has invaded the ship. A brutal cat-and-mouse battle ensues between Robeson and the intruder for control over the starship, with the fate of hundreds of Robeson's crewmates hanging in the balance.