Yemi is a student who also has to deal with the fact that her father is seriously ill in hospital. Along with her brother Lucas, she spends much of her free time sitting by their father's bedside but the doctors have told to prepare for the worse. Her brother Lucas says he may seek the assistance of someone who know about traditional healers but Yemi dismisses the idea. When Lucas disappears however, she finds an address among his possessions and goes to an old abandoned house where she finds strange markings on the wall, blood on the floor and her brother's name written on a candle. When she returns to the house the next day with the police, something is clearly wrong. The house has now been painted, is furnished and the people there claim they have lived in the property for two years. Unable to explain what may have happened, she approaches Dr. Andrew Gemill for help in understanding what is going on.

Having concluded that the George young Joe has been referring to is in fact Georgina McKay who disappeared six years ago, the investigators tell the missing girl's mother about their reincarnation theory. This doesn't sit well with the woman who clings to the hope that her daughter is still alive. As Joe begins to recall more about Georgina's life, the information begins to point to her father as her possible murderer. The police re-open the investigation into the girl's disappearance when they find her body in the loch - exactly where Joe told them to look. However, Dr. Monaghan thinks that Georgina's spirit may in fact be out for revenge.

Monaghan and his assistants investigate paranormal phenomena, specifically the transference of souls from the dead to the living or, more simply, reincarnation. After an unsuccessful trip to Lebanon where a young boy apparently had detailed memories of another life, they're faced with the case of 6-year-old Joe Quinn who starts to have memories of another life belonging to someone named George: a home by a lake; that his "other mummy" had red hair; and of a drowning. Is he however remembering a past life?

John Wade is convinced that he can cure young Chloe Williams of her brain tumor. Craig Stephenson is quite skeptical but newly arrived Peter Locke isn't and is quite keen to study the case. As they learn more about John's background and family history, they realize there may be a more than reasonable explanation for his behavior, though not all can be explained away. Justine McManus goes to Patience Green's home village and finds that it is much as she described it. Her knowledge of the locality and of the people who lived there is astounding but Patience does make one slip that leads Justine to believe there is an explanation for both her condition and her degree of knowledge about the community.

Although Daniel Blakemore has died accidentally, the Army still wants to know what the corporal may have told Professor Monaghan and his team. Monaghan himself feels a certain amount of guilt about Daniel's death and is having trouble sleeping. He even imagines seeing him from time to time on the the street or seeing a hooded faceless figure following him. He can't explain what is happening to him. He determines that he's probably being followed and suspects the military of being behind it all.

After dabbling in black magic, a young woman manifests extraordinary electrical phenomena. Monaghan and the team find themselves in a race to understand and fight the dark forces attacking her before it is too late. The season finale to series three.

Douglas and Justine continue their investigation, even though they were asked to leave the Morrisons house. From the family's reaction, Justine suspects that the strange occurrences may be linked to a Bolivian woman named Lygia who worked as a nanny for the Morrisons some years before, She follows up with Findlay Morrison who says that Lygia returned to Bolivia and has successfully completed law school since. It turns out the Morrisons paid her tuition as well. Douglas still thinks that Claire is the focus of any paranormal activity and decides to test her. As the volume of information continues to grow, Justine finds a vital clue. Douglas was correct in his thinking, only it's someone other than Claire with whom Lygia has made a psychic connection.

Douglas Monaghan welcomes back one of his former students, Peter Locke, now a professor who has made quite a name for himself in North America. Craig Stephenson studies the case of John Wade, a self-styled mentalist who has a successful stage show. Although he amazes his audiences, he is clearly using well-worn techniques to correctly guess information of audience members. There are a few anomalies however. Justine McManus meanwhile travels to a psychiatric hospital to investigate the case of a woman who claims she is the survivor of a shipwreck that occurred in 1904 - but only washed ashore in 2004.