Reacher Season 4 introduces a mystery surrounding Anna Merrick. Reacher Season 4 reveals who Anna is, teases the mystery around herAt first, Anna Merrick seems like an ordinary government employee. But Reacher soon suspects something is wrong about her death. Reacher Season 4 has turned Anna’s death into a dangerous conspiracy. With Anna and Cahill dead, Ben missing, and the flash drive still gone, Reacher appears to be deeper in trouble than ever.