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Historical thrillers · 1945–1948

The Callahan Files

The war ended. The struggle over its secrets did not.

Tyrol, Lyon, Salzburg, Prague, Berlin. From 1945 to 1948: the last weeks of the Second World War and the years after it, when the shooting stops and the war over paper begins: orders, ledgers, archives. Whoever holds the document decides what the world will be allowed to remember.

Captain James Callahan is an American officer who reads every document twice and knows that the most dangerous thing in Europe in 1945 does not always carry a rifle. At his side is Claire Dubois, a French courier who trusts no one in uniform and has her own reasons for searching the files.

Historical thrillers inspired by real events, told without heroics. Five novels in all. Each stands on its own. Read in order for the full story. Available on Amazon in Kindle (including Kindle Unlimited) and paperback.

The series

Five novels, one story.

Book One

The Third Copy

Available now Tyrol · April–May 1945 Published September 23, 2026

Tyrol, April 1945. The war has days left to run.

An American patrol finds an SS truck in a ditch, prisoners’ tracks in the mud, and a Wehrmacht major who knows where they were taken: Schloss Falkenhorst, a castle above the valley, where a doctor named Voss ran a chemical laboratory beneath the walls.

The SS are coming back for it. Sturmbannführer Krieger has orders to evacuate the records and the samples. If he reaches the castle first, he will kill the prisoners, burn the archive, and take the cylinders. Captain Callahan has a handful of exhausted men, Claire Dubois, and Major Karl Werner, who offers to lead them in through the boiler room. Inside the walls, a uniform no longer tells anyone which side a man is on.

Inspired by the Battle of Castle Itter, May 1945, when American and German soldiers defended the same walls against the SS.

Paper burns. Not every copy does.

Book Two

The Black Ledger

Pre-order Lyon · Salzburg · Werfen · May–July 1945 Release November 19, 2026

May 1945. The war in Europe is over. The looting is not.

When American troops seize a train loaded with property taken from Hungarian Jews, Captain James Callahan is sent to Werfen to look at the paperwork. He finds an open case with an empty space the size of a book.

In Lyon, Claire Dubois is following a different trail: a forwarding address, a burned fragment of a waybill, and the last traces of her brother, Étienne. Between Salzburg and Lyon runs a network that doesn’t smuggle. It files. Its routes pass through freight offices, clinics, and Swiss accounts, and its most dangerous record is a black ledger in which people and property share the same column.

Now Callahan must decide what justice looks like when the thieves have receipts, and when his own side wants the book more than the truth.

Inspired by the Hungarian Gold Train and the Allied hunt for Nazi assets.

Book Three

The Buried Archive

Coming soon Frankfurt · Prague · winter 1946

Frankfurt and Prague, winter 1946.

Crates of German documents, hidden in the last days of the war at Štěchovice outside Prague, are coming back to the surface. Someone wants part of them gone before anyone can catalogue them. Hana, a Czech archivist, knows every number on the inventory and knows what is missing from it.

Callahan and Claire return to the trail that went cold in Geneva: account 62104, and a name nobody has needed for a year.

Book Four

The Lyon File

Coming soon Lyon · Augsburg · Munich · Geneva · 1947

Lyon, April 1947. Someone borrowed a name. Someone else is paying for it.

In a widow’s kitchen, Claire Dubois finds what she has been chasing for a year: a freight firm’s receipt book, and in it the name Morel, signed in three different hands. The man who came for the book before her isn’t finished. Days later, the firm’s old bookkeeper finds a 1944 wage envelope pushed under her door.

Inspector Henri Dargent has a case of his own. A mechanic named Lucien Chenal died in February 1944 in a house where men were held between transports. The witnesses point to the man who signed as Morel: Viktor Rainer. France wants him. The Americans are paying him, in Augsburg, as a counterintelligence source.

Captain Callahan must decide how long usefulness can postpone guilt, and put his own name under the answer. And Rainer has something to offer Claire that no one else can. At a price she won’t pay.

Inspired by the U.S. Army’s postwar use of former Nazi intelligence personnel in occupied Germany.

A man the Americans need. A widow who has waited three years. A sister who will not sign.

Book Five

The Last File

In progress Frankfurt · Munich · Lyon · Berlin · 1948

1948. The war has been over for three years. Its files have not.

After the Communist coup in Prague, Callahan is ordered to put in order a card index built in the American zone. He recognizes his own copies in it: names from Tyrol, accounts from Lyon, extracts from the Prague archive. Each card on its own is true. Together they become a list of people to recruit, pressure, or trade. In Lyon, Claire finds a fragment of the same index where it should never have surfaced.

Between the Prague coup and the Berlin Blockade, both of them face the choice they spent four books condemning in others.

The final novel of The Callahan Files.

The first book asked whether the truth could survive. The last asks whether we can survive the truth.

Also by Dariusz Budyta

Quorum by Dariusz Budyta — cover

Quorum

Coming soonA political thriller · Warsaw · thirty daysRelease December 17, 2026

Warsaw, November. The president of the Constitutional Tribunal has been sent home for thirty days. One side calls it the rule of law. The other calls it a coup.

On the night Judge Teresa Halicka is to take over the court, the old archivist is found dead in the basement, his hand pressed over an index card from her personnel file, a date written in the margin. Iwona Lach, the registry clerk who has handed out the building’s keys for twenty-two years, slips the card into her pocket before the Director locks the door.

Outside, Chief Inspector Rafał Nowicki has thirty-four officers and a single sentence of orders: secure the adjacent area. Nobody tells him from whom.

Fifteen chairs. Thirty days. And a number below which the court cannot decide anything at all.

Two sides fight for a constitutional court. Neither knows who they really work for.

The author

Dariusz Budyta

Dariusz Budyta is a novelist, photographer and composer from Warsaw. He writes political and historical thrillers in Polish and in English, and photographs cities after dark. His photography holds the QPSA distinction from the Photographic Society of America.