Covert-One Series
by Robert Ludlum
In The Hades Factor, Lieutenant Colonel Jonathan Smith assembles a team of crack operatives to find out the truth behind a deadly new virus that has already claimed the life of his fiancee. Sequels include Cassandra Compact, Paris Option, Altman Code, Lazarus Vendetta, Moscow Vector, and Arctic Event.

Dirk Pitt Adventures
by Clive Cussler
In The Mediterranean Caper, Dirk Pitt plays a deadly game of hunter and hunted with the elusive head of an international smuggling ring. Series: Iceberg, Raise the Titanic, Vixen 03, Night Probe, Pacific Vortex , Deep Six, Cyclops, Treasure, Dragon, Sahara, Inca Gold, Shock Wave, Flood Tide, Atlantis Found, Valhalla Rising, Trojan Odyssey, Black Wind, Treasure of Khan, and Arctic Drift.

Gabriel Allon Series
by Daniel Silva
In The Kill Artist Former Mossad agent Gabriel Allon is called out of retirement to assassinate a Palestinian terrorist before he can kill Yasir Arafat. Series: The English Assassin, The Confessor, A Death in Vienna, Prince of Fire, The Messenger, The Secret Servant, Moscow Rules, and The Defector.

Jack Ryan Series
by Tom Clancy
Years before the incidents in Hunt for Red October, Jack Ryan saves the prince and princess of Wales and their infant son from a terrorist attack in the first book, Patriot Games.
Sequels include Red Rabbit, The Hunt for Red October, The Cardinal of the Kremlin, Clear and Present Danger, The Sum of All Fears, Debt of Honor, Executive Orders, The Bear and the Dragon, and The Teeth of the Tiger.

Jake Grafton Series
by Stephen Coonts
Starring Lieutenant Jake "Cool Hand" Grafton - naval pilots at war in the skies over Vietnam. Coonts flew A-6 Intruders in the Vietnam War and later served as a flight instructor. Titles include Flight of the Intruder, Final Flight, The Minotaur, Under Siege, The Red Horseman, The Intruders, Cuba, Hong Kong, America, Liberty, and Assassin.

James Bond Series
by Ian Fleming
The first of the James Bond adventures, Casino Royale, introduces a character very different from the one portrayed in the movies - he's a much more ruthless secret agent with none of the charm and panache of the screen legend. Fleming was a former intelligence operative. Other titles in the series include: Live and Let Die, Moonraker, Diamonds are Forever, From Russia with Love, Doctor No, Goldfinger, For Your Eyes Only, Thunderball, The Spy Who Loved Me, On Her Majesty's Secret Service, You Only Live Twice, and Man With the Golden Gun.

Jane Nichols Series
by Maureen Tan
In AKA Jane, former British MI-5 agent Jane Nichols now writes private-eye novels, but she finds that she cannot escape her past when an old enemy comes calling. Sequel: Run Jane Run.

Jason Bourne Series
by Robert Ludlum
In The Bourne Identity, a bullet-ridden man is pulled out of the water in Greece with no memory of who he is or who shot him. He eventually learns that he is Jason Bourne, a spy assigned to track down Carlos, an international assassin. Sequels include The Bourne Identity, The Bourne Supremacy, The Bourne Ultimatum, The Bourne Legacy, The Bourne Betrayal, The Bourne Sanction, and The Bourne Deception.

Kirk McGarvey Series
by David Hagberg
In Without Honor, Ex-CIA agent Kirk McGarvey is approached by two operatives from ""The Company,"" who request his help to track down a Russian mole in the upper levels of the US government.
Other titles include Without Honor, Countdown, Crossfire, Critical Mass, High Flight, Assassin, White House, Joshua's Hammer, The Kill Zone, Soldier of God, Allah's Scorpion, Dance With the Dragon, and The Expediter.

Kurt Austin Series
by Clive Cussler
The first book, Serpent, introduces the character of Kurt Austin, who, like Dirk Pitt, works for NUMA but is younger and less "John Wayne-ish." Austin must discover what went down on the Andrea Doria when she was purposely sunk. Sequels include Blue Gold, Fire Ice, White Death, Lost City, Polar shift, The Navigator, and Medusa .

Mrs. Pollifax Mysteries
by Dorothy Gilman
Bored and depressed after her husband's death, Mrs. Pollifax decides to take her doctor's advice and do something enjoyable. Since she has always wanted to be a spy, Mrs. Pollifax heads to Washington, D.C. and starts to work for the CIA. Mrs. Pollifax Mysteries

Peter Ashton Series
by Clive Egleton
In first book of the series, Hostile Intent,Peter Ashton is asked to investigate when a minor British official is blown up during a neo-Nazi riot in Dresden. When Ashton, the middle-ranking agent in charge of the case, is asked by his superiors to label it an accident, Ashton tries to discover the truth. Sequels include A Killing in Moscow, Death Throes, A Lethal Involvement, Warning Shot, Blood Money, Dead Reckoning, Honey Trap, One Man Running, Cry Havoc, Assassination Day, and The Renegades.

Rogue Warrior Series
by Richard Marcinko
A year after carrying out an assassination, the Rogue Warrior emerges from isolation ready for action and determined to bring down a terrorist organization that is threatening to nuke an American city in Rogue Warrior. Sequels: Red Cell, Green Team, Task Force Blue, Designation Gold, Seal Force Alpha, Option Delta, The Real Team, Echo Platoon, Detachment Bravo, Violence of Action, Vengeance, Holy Terror, and Dictator's Ransom.

Sean Dillon Series
by Jack Higgins
The first book is Eye of the Storm. During the Persian Gulf War, Saddam Hussein hires master terrorist Sean Dillon to assassinate Margaret Thatcher and her war cabinet at 10 Downing Street. Sequels:Thunder Point, On Dangerous Ground, Angel of Death, Drink With the Devil, The President's Daughter, The White House Connection, Day of Reckoning, Edge of Danger, Midnight Runner, Bad Company, Dark Justice, Without Mercy, The Killing Ground, Rough Justice , and A Darker Place.