Bullard asks Barnaby to investigate the disappearance of a friend's daughter who was a member of the Oblong Foundation, a cult based at Malham Hall. Jones goes undercover as a new recruit to solve the mystery, but he and Barnaby soon start digging in... (more)to an old case involving the death of a couple in a boat explosion, which could be linked to the missing woman. With Will Knightley, Kevin Doyle, Holly Aird, Barbara Flynn and John Woodvine

Barbara Flynn, Charity Wakefield, Christine Bottomley, Holly Aird, John Woodvine, Kevin Doyle, Oliver Ryan, Paul Hilton, Richard Albrecht, Simon Day, Tom Fisher, Will Knightley