Chris (Neil Stuke) is thrown off the balcony of a high rise block of flats – and it looks like murder.
Suspicion falls on his flat mate Dean (Joseph Mawle) who is profoundly deaf. Penny (Susan Lynch) is the sign language interpreter brought in to help the police question him.
But when Penny bumps into Dean later in a nearby pub, they embark on a secret affair which makes Penny’s impartiality as police interpreter harder and harder to sustain.
Dean needs Penny to prove his innocence, but as the police investigation continues, Penny starts to wonder if he is in fact the murderer after all.