The defenders investigate an explosion which leaves two brothers dead. A young girl is on the road to recovery after she was viciously attacked by her neighbours' dogs. And the victim of a crash for cash motor insurance scam is determined not to let the fraudsters get away with it.

The defenders battle to keep the roads safe as four people lose their lives when a lorry driver using his mobile phone ploughs into them. And they crack down on the rogue airport car parking companies ripping off holidaymakers.