Hawkeye and Mockingbird - Ghosts (2011)

Collects Hawkeye & Mockingbird #1-6.
Hawkeye, the world's greatest marksman is back -- and reunited with the world's most dangerous super-spy, Mockingbird! The deadly duo defied every obstacle to make their way back to each other and put together the all new WCA team -- but something from their mutual past returns to haunt them.