A young British widow shelters an old medical school colleague, a man who has somehow turned himself invisible. As his isolation grows and his sanity frays, he schemes to create a reign of wanton murder and terror across the city.
When Cecilia's abusive ex takes his own life and leaves her his fortune, she suspects his death was a hoax. As a series of coincidences turn lethal, Cecilia works to prove that she is being hunted by someone nobody can see.
Working in Dr. Cranley's laboratory, scientist Jack Griffin was always given the latitude to conduct some of his own experiments. His sudden departure, however, has Cranley's daughter Flora worried about him. Griffin has taken a room at the nearby Lion's Head Inn, hoping to reverse an experiment he conducted on himself that made him invisible. But the experimental drug has also warped his mind, making him aggressive and dangerous. He's prepared to do whatever it takes to restore his appearance.
After the mysterious death of scientist Dr. Devin Villiers, Det. Frank Turner and his partner are assigned to protect Villiers' colleague, who revealed that a veteran soldier was subjected to an experiment with the objective of creating the ultimate national security weapon... an undetectable soldier. The experiment failed – with disastrous side effects.