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Episode one
Tom Jackman, the only living descendent of Dr. Jekyll and Mr. Hyde, is a modern man with an ancient problem. He's fighting back - but are all the resources of 21st Century surveillance technology enough to keep a Victorian devil in check? While he's working to protect his wife from Hyde, he learns she's hired a private detective to follow him. Is there any way she's already seen Hyde in action? Could she possibly believe it's not him?

Dr. Jackman hires psychiatric nurse Katherine Reimer to help him and Hyde work better together. Tom asks Katherine about Hyde's activities as he downs a cup of tea. As he falls unconscious, he realizes Katherine has drugged him. Scared, she deletes the security footage, turns off the CCTV cameras, removes the fuse, and takes Tom's keys. She finds what she's looking for - an old envelope, a key, and a photograph of a young woman.

Later, when best friend and co-worker Peter Syme visits the zoo with Tom and the boys, one of the children is put in danger. But who would threaten the life of a six-year-old child? Tom realizes he can no longer trust anyone.

Episode two
Tom wakes with a deep bite mark on his thumb and his foot manacled to a radiator. The room has been trashed and a message has been left for him on the wall in dried blood, "When you sleep, I will eat your children." Tom realizes that Hyde is trying to take over. He phones Claire, desperate not to fall asleep and let Hyde take control, desperate not to let him know where his wife and family are.

Meanwhile, a group of men in white coats bundle a big metal casket into a van, executing a plan one hundred years in the making. Is Syme somehow connected to this plan, and not the good friend he claims to be?

Episode three
The episode begins when Tom and Claire first meet on a blind date. There's some chemistry between them, and when Tom wakes by Claire's side, he notices some thick hair on his arm. Fast forward to when the couple become the proud parents of twin boys - unexpected, as there was only one heartbeat. Tom then goes to the institute where he works and finds that his thumb print no longer opens the security doors. Are all these events related? Tom wonders what it all means.

Back in the present day, a van pulls into an underground garage. Claire demands to know why her husband has been locked in a big metal box by Syme, who she thought was going to help her. Meanwhile, Miranda, the private detective, shows up at the institute, threatening to expose what she learned while watching Tom for months.

Episode four
Episode four begins at the Edinburgh home of Dr. Henry Jekyll, in 1886. Robert Louis Stevenson has scheduled a meeting with the Doctor, and presents his business card and a manuscript. With the appearance of fiction but the substance of fact, the story lacks only an ending. Jekyll tells him he's dying because he can no longer control the changes. He hopes his last secret will die with him as he tosses a piece of paper into the fire.

Back in the present day, the metal casket is opened and Tom, pathetic and chained, calls out to Claire. When she gets closer, Hyde comes to life, declaring that Tom is dead. But then Hyde starts to get overwhelmed by visions as he's forced into Tom's memories. It's almost as though Hyde is re-booting his memory. Is this Tom trying to take back control?

A top mercenary has been training for the moment he'd be called to bring in Hyde — that time is now. Meanwhile, in a big country house, Syme descends deep into the ancient building's foundations — hell is on the lowest floor. The building is a fortress and a trap for a man who can rip out a lion's throat. Syme brings Claire and the boys to the house, as bait.

Lurking deep beneath the country house is the truth about Dr. Jekyll, Mr. Hyde, and the Jackmans. When all is revealed, it's more shocking than either Claire or Tom could have imagined.