'Piano Man', (Craig Parkinson), an amnesiac arrested after an altercation at a local train station, is implicated in series of unsolved armed robberies committed by an offender known only as the 'Boston Bandit'. Although CID are keen to wrap the case up, Bill suspects that 'Piano Man' may have been framed and sets about discovering the truth. Lydia comes under fire when a personal connection to one of the victims in the case is uncovered. (thetvdb.com)