Mark O'Neill

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Mark O'Neill's Latest Book

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  • Bibliography:
    26 Books
  • First Book:
    June 2015
  • Latest Book:
    April 2025
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Book List in Order: 26 titles

  • The Monsters Go To The Library

    Prepare for some spooky fun, as some monstrous library patrons attempt to return some overdue books. They just might find out that volunteering to help others and catching up on some good reading is more fun than scaring people. It's a real p...

  • The Reichsbank Gold

    When Germany Is Under Attack, A Lethal Response Is Required. Department 89 is a secretive German government department that deals with serious threats to the state. They are unofficial, ruthless, and above the law. They answer only to the German chan...

  • The Reichsbank Gold (Department 89, #2)

  • The Executioner

    One Man Holds The Key To The World's Nuclear Balance Of PowerA German Intelligence agent, who was long-term deep undercover in the Russian FSB, is betrayed and forced to go on the run. He makes it as far as the forests of Smolensk before being captur...

  • Sovereign Territory

    You Can't Run From Justice From Major Sophie DeckerA drunken US Embassy official in Berlin crashes his car into a playground and kills six German children. But when it emerges that he intends to exercise his right to diplomatic immunity to escape pro...

  • The Assassin's Child

    There Are Some Secrets That Refuse To Die. For years, Major Sophie Decker has had to live with the memories of a terrible childhood in Communist East Germany, and an alcoholic father who worked for the Stasi secret police, who sexually abused her. Th...

  • The Beethoven Syndrome

    A Deadly Pathogen. Millions Of People. A Race Against Time. It's 1944 and in the closing stages of the war, Nazi scientists finally perfect a nerve gas that has the potential to cripple the invading Allied armies and turn the tide of the war in favou...

  • The Traitor

    An Elite Military Intelligence Unit Fights Tooth & Nail For Survival.Since day one, German special forces Major Sophie Decker has had a ruthless enemy in the government who wants Decker's department destroyed. He has tried and failed twice. Now with ...

  • The Peace Emissary

    Safeguarding The Peace Can Be a Deadly BusinessA North Korean diplomat comes to Berlin wanting to speak with the German chancellor, Claudia Meyer. He suggests that the country is ready to topple the Communist regime and seek peace with the West.But w...



  • The Desert Scorpion

    If You Cross The Scorpion, Beware Of Its Deadly Sting....In The Renegade Spy, the Scorpion is a merciless and psychopathic assassin, hired to murder the German chancellor. But years before, he used to be a Foreign Legionnaire, a man of honour. What h...

  • Operation Eternal Vengeance

    A Devastating Terrorist Attack Cripples BerlinAfter the failed attempt to kill a defector who fled to Germany, North Korea carries out a revenge attack in Berlin. It is the most serious attack on the city since World War II.Major Sophie Decker of the...

  • The Praetorian Scorpion

    Former Legionnaire Jens Schacht is in hiding from the British Government after wiping out a British army unit in Iraq. He covertly enters the United Kingdom, intending to hide out in the Highlands of Scotland until the official heat dies down.But fat...

  • Above The Law

    Sophie Decker Must Show Nobody Is Above The Law When a refugee is accused of a vicious sexual assault and robbery, outraged members of a far-right nationalist group vow revenge. Setting up armed vigilante groups in the town of Hofstadt, they dec...

  • Department 89 Case Files - Volume One

    SOVEREIGN TERRITORYA drunken US diplomat accidentally kills six German children in a car accident. But when his corrupt US Ambassador boss invokes diplomatic immunity, Major Sophie Decker decides to prove there is no such thing as sovereign territory...

  • Regime Change

    It’s been six months since German Chancellor Claudia Meyer declared war on North Korea after the bombing of the German Bundestag. But the war has ground to a halt. Major allies are deserting under pressure from an aggressive US President, and Pyong...

  • Department 89 Series Books 4-6 Boxset

    Department 89 - a German Military Intelligence unit that officially does not exist.When a nation is under attack from its enemies, it needs a defender to come to its rescue. A defender not constrained by rules and laws, morals and ethics. For Germany...

  • A VERY Bloody Christmas

    It's three days before Christmas and Department 89 has received credible intelligence that a Berlin department store is about to be bombed. When the store manager refuses to close the store, Major Sophie Decker decides the only course of action is to...

  • Operation Thunderbolt

    For every action, there is a consequence. Germany's elite Department 89 has crossed paths with the Central Intelligence Agency on more than one occasion. But after their last encounter, Langley decides enough is enough. Sending a covert bla...

  • The Devil Incarcerated

    The only clue to stopping an assassination lies behind bars. Former German soldier Gabriel Keller is serving a life sentence for murder. Told by a judge that he is too dangerous to ever be released, Keller is a man without purpose. Surviving, no...



  • God - A Christmas Visit

    What if God decided to celebrate his son's birthday on earth?God - A Christmas Visit is an entertaining fantasy that deals with the positive aspects of the human psyche in a fun and light-hearted way, a story of loss, hope and redemption....

  • Valkyrie

    Nazis in South America. A Nuclear Bomb. Only Department 89 Can Stop It. When German Major Sophie Decker and her military intelligence unit assassinate a Columbian drug dealer named Hector Gonzalez, little do they realise they are about to uncove...

  • The Little Wooden Train

    A heartwarming story of how Christmas was saved by a toy maker, a young girl and her little wooden train. This beautifully illustrated children's book is a must-read for children of all ages that will fill you full of festive cheer and merriment....

  • To Catch a Spy

    It’s been a year since John Robie, notorious Riviera jewel thief, proved his innocence by catching a copycat burglar. And it’s been a year since John has seen Francie Stevens, the adventurous socialite who not only saw through his disguise, but h...

  • The Reichsbank Gold (Department 89, #1)

    • / General Fiction
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  • The Renegade Spy

    • / General Fiction
    • Buy Buy

    A Deadly Assassin Is After The German ChancellorGerman Intelligence officer Captain Sophie Decker has a reputation for refusing to play by the rules. This has made her enemies in her own service. But when an informant reveals a plot to assassinate th...

  • The Undertaker

    • / General Fiction
    • Buy Buy

    You Can Never Leave Your Past BehindJohn Smith is an ordinary man, with an ordinary job and a family. But it wasn't always like that. Nicknamed The Undertaker, he was once an assassin, until he fell in love and turned his back on his violent life for...

Frequently Asked Questions (FAQ)

Mark O'Neill has published 26 books.

The next book by Mark O'Neill, To Catch a Spy, will be published in April 2025.

The first book by Mark O'Neill, The Monsters Go To The Library, was published in June 2015.

No. Mark O'Neill does not write books in series.
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