桑福德（约翰·库萨克 John Cusack 饰）是一名精神病医生，在治愈他人疾病的同时，桑福德自己的家庭却伤痕累累。儿子本杰（伊万·伯德 Evan Bird 饰）年纪轻轻却因为吸毒而被关进了戒毒所，女儿阿加莎（米娅·华希科沃斯卡 Mia Wasikowska 饰）更糟，她竟然因为纵火而被关入了精神病院。...
In a near future, crimes and accidents can be prevented by making just one phone call to the past. However, the peace of this utopian world will be disrupted by a methodical killer who seems to have discovered the only flaw in this system....
