I was doing some research into extradition recently, having been inspired by The Great Train Robbery. Since the story involved extradition of British nationals, that committed a crime within the UK, I had a brief look into countries which do not have extradition treaties.
I stumbled upon extraterritorial jurisdiction, which is when a person can be reprimanded for an action which took place outside of that country's borders. Very shocking indeed!
Tunisia does not have an extradition treaty in the UK, but I was wondering whether they could charge someone for a crime committed outside of Tunisia on the basis that the person is living there as a resident (or other scenarios)? For example, they came over on a British passport and remained living there for a period of several years.