Matters are becoming more complex and shocking than ever now as we move several days further back into the past – another murder victim is found and there seem to be links to the acid killer.

But is everything really as it appears?

Meanwhile, more comes to light about ever-so-slightly-creepy Patrick Barker (Paul Rhys), and Gabriel is distracted by his own equally challenging private life as we discover the danger his daughter Hannah has put herself in after going missing.