National Security Adviser Admiral Arnold Morgan is very concerned when the H.M.S. "Unseen," one of four diesel-electric submarines owned by the Royal Navy, vanishes, and a year later his fears are realized when the sub, modified into a dangerous anti-aircraft weapon, makes a reappearance in the control of a terrorist spy.
PARALLEL TITLE PROPER
Parallel Title
HMS Unseen; Her Majesty's Ship Unseen
TOPICAL NAME USED AS SUBJECT
Submarine chasers -- Fiction.
Submarines (Ships) -- Fiction.
United States. -- National Security Agency -- Fiction.