高端牙科诊所的牙医程皓身兼双重身份,业余时间还是一名“恋爱先生”,专门在情感的道路上帮人出谋划策,但自己感情生活却一片空白。程皓在客户的一场婚礼前,偶遇伶牙俐齿的罗玥。二人状况百出,彼此嫌弃。但这一切,却在罗玥无辜遭遇“情感骗子”已婚的宋宁宇后,悄然发生改变。宋宁宇的妻子顾遥在被丈夫出轨的消息打击后黯然回国。程皓的兄弟张铭阳在机场邂逅顾遥,以“情场高手”著称的他竟手足无措只好寻求程皓的帮助,
Lewis returns to Oxford after several years absence and is reluctantly assigned by his new boss, DCS Innocent, to the murder of an Oxford mathematics student who was shot while participating in a sleep study. The key-code used to access the sleep lab was assigned to a fellow maths student, Daniel Griffin, but Daniel's math tutor has provided him with an alibi. Daniel is a maladjusted young man who will soon inherit his father's automotive empire. He is disruptive and has no respect for his uncle who now heads the company. The future of the company however rests on an impending deal with Japanese investors who insist that family unity is all important at this time. When two other murder occurs, Lewis must decipher a cryptic clue left in an old case file by his former boss, Chief Inspector Morse.