The Sword of God

When the greatest sacrifice may still be too little
The expedition to the dark cloud LDN 63 has solved the riddle of the mysterious events there - but at a high price. Thousands of alien ships threaten Earth's emissaries. The only way to stop them could be an ancient weapon.
But to trigger it, astronomer Celia and her colleagues must give themselves up – while it is not at all certain that their sacrifice can really prevent the worst: Even then the attackers might reach the solar system and Earth.
The expedition to the dark cloud LDN 63 has solved the riddle of the mysterious events there – but at a high price. Thousands of alien ships threaten Earth’s emissaries. The only way to stop them could be an ancient weapon.
But to trigger it, astronomer Celia and her colleagues must give themselves up – while it is not at all certain that their sacrifice can really prevent the worst: Even then the attackers might reach the solar system and Earth.