the movie frailty be actually more of a psychological thriller than it be a horror film . it have all the trapping of a horror film but this it be not . frailty be a film about perception of religion and realize the difference between right and wrong . in frailty and a middle age father ( bill paxton ) and his two son claim to be do the work of god . it turn out that they be a trio of notorious serial killer call god hand . we watch the father kill the demon in some rather brutal way while convince his son and himself that they be do the work god and that what they be do be right . he claim that he receive a message from an angel who give him specific instruction to eliminate the demon live here on earth . god have give him a list of name and in return for his service while he and his son will be give protection and which basically mean the police will never be able to capture them . we see all of this unfold in front of u in a very disturbing manner . but what be really disturb about it all be the effect that it have on the two son and particularly the old son and adam . adam himself seriously doubt the existence of a supreme be and that be until his father and a week in the cellar change all of that . he know that his father have obviously lose his mind and be pretty sure the same be happen to his young brother and fenton . fenton and the other half of this puzzle and take everything in a if it be his own religion . he seem trap in his father world of god and demon . i suppose this be because he so young and easily impressionable . but everything that happen to these three be rather convincing and in fact and too convincing . the event that occur in the film can be look upon a a vivid hallucination that be be experience by the three main character . i say this because they each react to the situation in different way and at one point in the film they each claim to see god . dad first see the murder a his mission . his mission eventually consume him and quickly turn into an obsession with eradicate demon . in fact and his hallucination be the primary one . his order and the list of name he receive be all a part of this hallucination . watch the scene where dad find the ax in a barn to figure out where i be come from . fenton and the young son and be easily impress by all of this talk of demon and destruction . since he be so young and it easy for him to fall into his father trap . adam and on the other be very skeptical towards his father action . spoiler in a way and the hallucination end when dad be kill towards the end of the movie . ( i will not say how or under what circumstance ) . but i will say that it be not pleasant . after his death and it fast forward to the present day . ( the story be be tell through flashback and a see through the eye of the old son adam ) . in actuality and it be fenton that be tell the story and not adam a originally believe . the story be be tell the way he perceive it and through his action and his brother action . fenton have go insane and be continue what his father start by lure the fbi agent into his trap . since religion be a major theme in this movie and the film also play on how easy it be for religion to be misinterpret by those that do not have a full understanding of it . before dad discover his newfound mission and he himself do not have a clear understanding of religion nor do he fully believe in a supreme be . his son fenton and adam often sing innocent little child church hymn but yet probably do not have a clear understanding of what the lyric meant . after the revelation of dad newfound mission and they both take off in separate direction adam remain in doubt of there be a supreme be while fenton be gradually suck into his father madness . a very good thriller that will creep the heck out of you and do not watch it alone .