While researching a new drug, Dr. Jack Griffin stumbles on a potion that can make him invisible. His obsession to create this potion and succeed with his plans drive him to insanity, eventually pushing his fiancée out of their relationship. When he seemingly commits suicide, things seem to be over. But when his ex claims to have seen him stalking her, a violent rampage begins. This pushes her into joining forces with the police and Jack's old partner Arthur Kemp to try and stop Jack...but it may already be too late.
