The Last of the Bullet Chasers

Cooper flies the Monte Carlo, a ship built to catch munitions that missed their targets in space only to put unsuspecting worlds in danger years, perhaps centuries later. The Monte Carlo is going after a missile group drifting next to the speed of light this time, and if they don't get everything exactly right, the civilization in the Rega Gain Solar System will be destroyed.

War has gone interstellar, and the galaxy has become an even more dangerous place. Firing a weapon in the vacuum of space can cause repercussions days, years, or even centuries later when that bullet, missile, torpedo or other instrument of destruction makes an impact. That’s where heroes like Cooper come in.
Interplanetary civil war has raged on in his home solar system for decades. Every missed shot could strike an unsuspecting innocent and one side is interested in keeping the devastation of their conflict from spreading to the rest of the universe. That’s why they started the Chaser program, which enlists pilots like Cooper, callsign Breaker, to pursue wayward munitions so they can be destroyed before they end a civilization, wreck a space station, or end all life on worlds that had nothing to do with the fight that inspired the firing of a weapon.
With the civil war winding down, the government is changing, and the Chaser program is coming to an end, but not before Cooper, a faithful repair robot named Ratter and the rest of the crew of the Monte Carlo finish one last pursuit. There’s a dangerous group of missiles and torpedoes travelling at nearly the speed of light headed for the civilized Rega Gain system. There is enough antimatter aboard those munitions to crack a planet.
For reasons he’s not sharing, Cooper is determined to stop the missile group from destroying the terraformed moon of Tamber and damaging the world it orbits, even if years pass relative to the minutes it takes the Monte Carlo to finish its mission in this all-or-nothing effort.
Come and witness the end of a tradition of duty, sacrifice, and glory. Will it be the end of the crew, or lead them to a new beginning in a solar system that is largely unaware that they’re in danger, but the crew of the Monte Carlo are desperate to save?