关键第四号续集叫什么

Kathryn, a struggling actress and unfulfilled housewife, becomes involved with her new gardener, Ben. As he gives her the attention and sensitivity she craves, they start to fall for each other. But Ben is not what he seems.。南宋绍兴年间，岳飞死后四年，秦桧率兵与金国会谈。会谈前夜，金国使者死在宰相驻地，所携密信也不翼而飞。一个小兵与亲兵营副统领机缘巧合被裹挟进这巨大阴谋之中，宰相秦桧限两人一个时辰之内找到凶手，而事情却远没有这么简单…… 伴随危机四伏的深入调查，案件的背后似乎隐藏着一场更大的阴谋。局中有局、人外有人，人心叵测、生死难料，一夜之间风云变幻，各方势力暗流涌动……。