Nathan has no real relationship - except with his imaginary friend.

Nathan's paranoia ratchets up to 11 when his family is threatened with murder if he doesn't finish
his neuroscience research - so he decides to bring his imaginary friend to life in order to protect
his adoptive parents.

Unfortunately his 'friend' is far more murderous than he could have expected.

As his imaginary friend escalates violent crimes, Nathan discovers the threat to his parents is
his biological father, driven by bitterness and in search of the people who kidnapped his son. Once
he's dead, Nathan's friend realizes the only way he can be completely free is by killing Nathan.

But he's the only friend Nathan's ever had - can Nathan make the decision to kill him?