Ether

Leo Mirski translates technical documents in a rented Queens apartment, keeping his old life in Army intelligence safely in the past. Then his brother Peter, a defense-lab biochemist who read the label on every cereal box, turns up dead of a heroin overdose in a Bronx rental car. Peter left behind a locked cabinet, an encrypted thumb drive, and one instruction: find a retired chemist in Kraków who knows about Ether. Someone is already picking Leo's locks.