The rules of a thriller

some directors and film makers say 'there are no rules' or that 'the rules are there to be broken'.

But also some directors say that certain conventions that mainstream films observe in order for them to appeal to the biggest audience.

Most thrillers have the main features in their films such as:

• different technical aspect 
• good Vs bad
• dilemas
• antagonists
• main characters
• heros
• villans

some films that show this are 'children of men'