Siege of silence - A J. Quinnell

Goodreads 3.96

A vital Central American nation has fallen to Cuban-backed guerillas. The American ambassador is held prisoner. And the US President faces the get him out ... or kill him. In as rat-infested room ambassador Peabody faces a brilliant, ruthless young protege of Fidel Castro, Jorge Calderon, who is determined to extract the truth behind a secret CIA operation against Cuba. Meanwhile, back in Washington, the President is caught between CIA strategists who want to eliminate Peabody before he can reveal the CIA's plans, and Colonel Silas Slocum, the one man who believes he can rescue the ambassador in an awesome and daring rescue...