Kath, a shy young woman, befriends Bob, the reclusive gardener at a seaside hotel where she's getting married. Kath has never come to terms with her mother leaving home when she was eight and that her overbearing father, Ken, never talks about her. Now she is getting married to escape, only to discover that her fiancée, Steve, is completely dominated by Ken as well. Bob is a gentle, eccentric man with a dry sense of humour and a troubled past. He spent a long time in prison and in the years he's worked at the hotel he has never ventured beyond the gardens, which he tends with obsessive care. Kath sparks a connection to an unresolved relationship from Bob's past with a girl called Louise which resonates so strongly that he feels compelled to leave the safety of the hotel and confront his past.
인간과 요괴 사이에서 존재하던 고대의 휴전 협정이 수 천년이 지난 후, 세상을 지배하려는 요괴 세상의 누아다 왕자에 의해 깨어진다. 누아다 왕자는 세상을 장악하기 위해 파괴를 목적으로 한 기이한 창조물들을 찾고, 수 천년간 잠들어있던 최강의 군단 ‘골든 아미(Golden Army)’ 를 깨운다. 이에 '헬보이'는 불을 다스리는 여자 친구 ‘리즈’, 사람의 마음을 읽는 ‘에이브’ 등, 각기 다른 능력을 가진 BPRD 요원들과 함께 누아다 왕자와 골든 아미를 막기 위한 최강의 대결을 시작한다!
