The team are in the Highlands of Scotland, looking for a dangerous builder with many complaints against him whilst Angellica joins a Trading Standards team investigating a tip-off about deadly toys being smuggled into Britain.
Mark Clemmit and Mark Millar continue with their quest to hunt down tradesmen who have left houses in really bad conditions. Each year around 7,500 unregistered and illegal gas engineers fit 250,000 appliances in homes all over the the country leaving lives at risk. The team go undercover to expose a serial offender who has been carrying out illegal gas work for years. Angellica is with pest control specialists as they attempt to work out how rats are accessing a family home in Swindon.
Mark Clemmit and Mark Millar are on the trail of a builder who turned a semi in Swansea into a lethal building site. Angellica Bell joins an investigation targeting a criminal bringing dangerous medicines into homes all over the country. And the spotlight is shone on a common danger lurking in our homes, linked to increasing the risk of developing respiratory illnesses.