Hawkeye & Mockingbird/Black Widow - Widowmaker

"Hawkeye and Mockingbird discover espionage agents around the world are being assassinated, their covers blown, and governments' intelligence and security capabilities devastated. The next target: Mockingbird! The former couple travels to Russia to investigate the death of the latest super-spy victim and is met by another target on the hit list, who also happens to be one of Hawkeye's exes: the Black Widow! It's a high-octane, international-espionage adventure featuring Marvel's avenging super-agents matching wits and fists with the Black Ocean Society, the Supreme Soviets and an all-new Ronin"--Page 4 of cover.