False Friends (en Inglés) - James Cole

She has spent her career making other people's lies sound polite.

Now someone wants her to prove them.

Mara Engstrom is a UN interpreter in Geneva, fluent in six languages and one thing most people never learn: the exact sound a human voice makes when it is trying to deceive you. She has spent fifteen years translating speeches so carefully polished that the lies inside them shine.

Then a stranger leaves a note in her mailbox. A proposition. A classified AI system called VERITAS, capable of detecting deception in real time. One week in Vienna, monitoring nuclear negotiations with Iran. Fifty thousand euros. And the promise of something she has wanted for twenty-six years: the truth about her father's death.

What Mara finds in that basement is worse than she expected.

VERITAS works. It works perfectly. On everyone at the table, including the Americans.

As Mara begins to understand that the system has been calibrated not to reveal truth but to manufacture it, and that she was brought to Vienna not as an expert but as a witness to a crime being committed in the name of national security, the question stops being what the machine knows.

The question becomes what she will do with what she knows.

A novel about language, loyalty, and the cost of telling the truth when the institution you work for has decided truth is a liability.

"The worst thing a diplomat can do is confuse loyalty with silence."

Perfect for readers of:
- John le Carre and the moral complexity of Cold War spy fiction
- Mick Herron's Slow Horses: institutional rot and outsider conscience
- Suki Kim's The Interpreter: language as a lens on power
- Smart thrillers where the weapon is a woman who listens too well

Themes include: AI and deception detection, nuclear diplomacy, father-daughter legacy, whistleblowing, surveillance ethics, and a protagonist who wins by choosing the most dangerous thing she owns: her professional word.