In this episode, the experts take on a doubly challenging investigation as they try and prove that not one, but two paintings are missing works by John Constable, one of Britain's best loved but most widely faked artists. Gillie Dance used to keep her painting of "Yarmouth Jetty" under the bed in her London home, never quite believing it was by John Constable - but the team starts to get excited when a previous owner turns out to have a close connection to the Constable family. Another painting, "A Sea Beach Brighton," used to hang in Boston's prestigious Museum of Fine Arts - until they it sold off at a fraction of its possible value in the early '90s. American attorney Tom Toppin and his wife Bernie snapped it up and they've been struggling to prove its authenticity ever since. Philip has a hunch that the proof they seek lies in other Constable paintings in U.S. galleries. Will the experts agree? There are surprises in store when paint analysis suggests one picture has a murky past, while an X-ray leads to one of the biggest shocks of the series.