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1. Which branch of the police force investigates 'bent' coppers?
2. Who is revealed to be 'The Caddy'?
3. Which actor plays undercover agent John Corbett?
4. Who does Tony Gates have an affair with?
5. Which police operation investigates the murder of journalist Gail Vella?
6. What is the name of the boy's home at the centre of investigations in series 3?
7. Which officer is revealed to be a relative of Tommy Hunter?
8. What does OCG stand for?
9. What letter does Dot Cottan 'blink' for in his dying declaration?
10. What is the name of the missing teen in series 2?
11. PC Georgia Trotman dies in the line of duty: how?
12. Where are series 2-6 of the show filmed?
13. In series 3, Dot removes a crucial piece of evidence from Danny Waldron's flat: what is it?
14. Which female officer, played by Anna Maxwell Martin, investigates SI Ted Hastings in series 5?
15. Which police branch does DS Arnott initially work for?