Ingression.

After his wife Lucy walks out on him, Alexander tries to seek solace in alcohol and drugs, but the pain just won't go away. He is given the address of a mysterious man who claims to have the answer; a strange, powerful narcotic that will take away his anguish. Alexander can't take any more so he visits the dealer and is given the drug. For a while he feels fine, life is good again, until he realizes that shadowy figures are pursuing him. He tries to escape but there is no hiding from the Ingression.