Conflicted in spirit and flesh, neuroscientist Alex Hunter struggles to reconcile his religious upbringing with his scientific mind. He studies love in the brain, but his scientific ambition prevents his personal experience of love. To save his collapsing marriage, he invites his wife and son on a research trip to the Congo that soon becomes a struggle for survival. When a mysterious virus starts destroying the love neurons of the brain, he fights to save his family and his own soul.