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Part 1
The team are called in when escaped psychiatric patient Daniel Lennon directs a family to unearth a 40-year-old male body in their Hampstead garden. Unable to remember killing his parents, for which he was convicted, Daniel is off his medication, on the run, and has started taking LSD. His psychiatrist suspects he is cutting adrift and becoming something new. The question is why. And how much of a threat does he represent?
The team questioning his brother Chris. They realise the body in Hampstead was buried during the six months when, as a young man, Daniel went missing from the family garden nursery business. They discover the body is an Austrian student Rolf Voller who went missing in the UK in the 1960s, having ingested large quantities of LSD. The team question consultant psychiatrist Dr Raymond Parke who worked with Voller. Both knew Daniel. Parke warns them to find Daniel quickly.
Believing the answers to Voller's death lie in the case of Daniel's murdered parents, Eve examines the greenhouse, where they were killed. As night draws near, Daniel appears at the window. Eve tries to probe Daniel about Rolf, but Daniel escapes. Daniel cons his way into the home of elderly Dr Parke, telling him he's done what he told him, muttering 'free yourself and know yourself'. Trapped in his own home, Parke frantically tries to get away.
Part 2
The team talk to former patient Heather Hardiss. They learn that, in the 1960s, Parke treated both Heather and Daniel in a hippy squat inside the Hampstead house where Voller's body was found. Parke pioneered taking psychiatric patients off their medication. Stella follows Daniel's nephew Mark to woods where Daniel's hiding out. But Daniel, sensing Mark's led her there, attacks him then escapes.
Eve, detecting a large amount of LSD in vomit in the woods, suspects Daniel's using it to recall memory. Chris is still haunted by horrific flashbacks from an acid trip he took when visiting Daniel in the squat. Chris remembers Daniel going up to a room and the horrendous noises which came out of it. The team discover that Parke and Voller used role play to recreate disturbing experiences from their patient's past – in Heather's case re-enacting abuse from her childhood.
Riled by Boyd's accusations, Parke stabs him in the hand with a pen. Watching a documentary about Parke, Boyd recognises Leaf, Daniel's second girlfriend at the squat, as Dr Ritter. They realise she was having a relationship with Daniel and may since have been keeping Daniel doped up on medication to stop him from remembering anything. In replicating the parental murder scene, Eve realises from the blood spray pattern that Daniel couldn't have killed his parents.
They pursue a confession from Chris. Realising Daniel's instability, Chris managed to convince his impressionable brother that he'd killed them himself. When the team go to question Dr Ritter, Daniel's already there. She swears her love for him, but he no longer believes it is love. He holds a knife to her throat. Daniel's acid trips have helped him remember – he killed Voller when he found him in bed with Leaf role playing. But Boyd forces Chris to convince Daniel of the truth. Daniel, releasing Dr Ritter, has to face the fact that he didn't kill his parents, and that his brother Chris is a murderer.
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