Through the Breach — David Drake

His acclaimed novel Hammer's Slammers has become one of the all-time classics of military science fiction. His novel Igniting the Reaches launched a bold new epic of cosmic conquest. Now David Drake returns to that savage frontier of space--where pirates rule a new age of opportunity and danger...

They hope to claim the wealth and glory of a galaxy at war. Their mission is called the Venus Asteroid Expedition, but it has little to do with legitimate trade. Their destination is the Mirror, the impenetrable membrane of another universe--a universe that holds all the riches of the Federation. And their only point of entry is Landolph's Breach. But the last person to pass through was Landolph himself. And most of his men never returned...