Blue Murder Season 3 Episode 3 The Spartacus Thing

Janine investigates when a man recently released from prison is found strangled with a dog chain. It appears to be an open-and-shut case when Vinny McAteer admits killing his son-in-law, but the detective, harassed by the arrival of new boss Det Supt Louise Hogg, soon finds all the dead man's in-laws are queuing up to confess individually to the crime.