The most highly efficient and lethal underwater ship ever built, H.M.S. Unseen, vanishes into the depths while on a training mission, baffling British and American military intelligence including wily National Security Adviser Admiral Arnold Morgan.

NSA director Theodore Anders has a simple goal: collect every phone call, email, and keystroke tapped on the Internet. He knows unlimited surveillance is the only way to keep America safe. Evelyn Gallagher doesn't care much about any of that. She just wants to keep her head down and manage the NSA's camera network and facial recognition program so she can afford private school for her deaf son, Dash. But when Evelyn discovers the existence of a program...