Jackson Lamb is not the type of person who shares a lot about himself, but the Slow Horses season 5 finale just exposed one harrowing truth about the Head of Slough House. After a slower season of Slow Horses , the finale packed in a lot of drama and excitement.

With the underdog team coming out on top, and helping to put a stop to a terrorist group's efforts to assassinate both the mayor of London, and the Head of MI5, there was a lot going on in the finale. However, one small detail revealed volumes about Gary Oldman's character in the British spy drama.

And considering how intensely private Jackson Lamb appears to be throughout the rest of the series, it's surprising to see such a vulnerable detail revealed about the Stoic and grimy spy. But, it could also be the key to unde

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