Diana and Regina go to a mysterious artist's exhibition whose works portray scenes of violent death. While there, Diana observes two pieces of art that remarkably resemble a girl who recently went missing and becomes very intrigued. When the identity of the missing girl is confirmed by her millionaire boyfriend, Diana and Regina are determined to solve the case and begin investigating what seems to be the 'gallery of horrors', At a swinging nightclub, the undercover angels meet a man who introduces himself as Claus Tiller. He invites Diana back to his secluded house and is unaware that Regina follows. Surprisingly the girls uncover the secret of their gallery mystery... but their lives are in danger.