A high school student whose father and sister were recently murdered begins her own investigation after two of her fellow cheerleaders are kidnapped

在莎拉（Sarah）生日那天，她最好的朋友维多利亚（Victoria）给了她一套基因检测试剂盒作为礼物，以便她可以更多地了解家人的血统。但是那天晚上，维多利亚被惨死了。几周后，莎拉敲了敲门，是警察。