Host Paddy McGuinness and celebrity investigators Jimmy Carr, Alison Hammond and Amanda Holden are joined by guest star Nadine Coyle.
This time, sisters Jen and Nadine from London are hoping to use their detective skills to spot the imposters and win £10,000. But with a line-up including a singing plumber, a cruise ship star and nail technician, it may be tougher than they think!