ated ▁with ▁Rach el ▁( J a ime ▁W inst one ), ▁a ▁woman ▁he ▁met ▁in ▁one ▁such ▁room . ▁With ▁her ▁prompt ing ▁he ▁agre es ▁to ▁make ▁friends ▁with ▁her ▁brother ▁John . ▁Mark ▁quickly ▁begins ▁to ▁fall ▁for ▁her , ▁sympath izing ▁with ▁her ▁tales ▁of ▁domestic ▁ab use ▁by ▁her ▁boy friend ▁Kevin ▁( M ing us ▁John ston ) ▁while ▁bel ieving ▁that ▁they ▁cannot ▁meet ▁because ▁she ▁is ▁in ▁a ▁witness ▁protection ▁program . ▁▁ ▁Mark ▁is ▁hor r ified ▁when ▁John ▁inform s ▁him ▁that ▁Kevin ▁has ▁killed ▁Rach el , ▁and ▁he ▁begins ▁planning ▁reven ge ▁against ▁Kevin . ▁Mark ' s ▁san ity ▁has ▁been ▁slowly ▁coming ▁apart , ▁cul min ating ▁in ▁his ▁beginning ▁his ▁plans ▁to ▁st ab ▁John ▁after ▁another ▁online ▁friend , ▁M I 5 ▁agent ▁Jan et ▁( L iz ▁White ), ▁tells ▁him ▁that ▁John ▁is ▁a ▁person ▁of ▁interest ▁to ▁the ▁ag ency . ▁It ▁is ▁eventually ▁revealed ▁that ▁John ▁orch estr ated ▁the ▁entire ▁thing ▁and ▁that ▁there ▁is ▁no ▁Rach el ▁or ▁Jan et , ▁and ▁that ▁he ▁pret ended ▁to ▁be ▁various ▁people ▁in ▁order ▁to ▁get ▁to ▁Mark . ▁ ▁Cast ▁Jam ie ▁Black ley ▁as ▁Mark ▁T oby ▁Reg bo ▁as ▁John ▁Jo anne ▁Fro gg att ▁as ▁Det ect ive ▁Ins pect or ▁Sarah ▁Clay ton ▁L iz ▁White ▁as ▁Jan et ▁Ja ime ▁W inst one ▁as ▁Rach el ▁Mark ▁W om ack ▁as ▁Mark ' s ▁D ad