In the Hall of the Mountain King
by L. R. Knupp
Half a million years ago, two races in a far galaxy went to war. The losers handed off their war to Earth along with the technology to fight it. Now, the secret Earth organization known as The Blade is realizing that the enemy they signed up to fight is not the one they're actually fighting.
In fact, it seems their worst enemies are on Earth, proving that gifts from strangers can be dangerous.