已过而立之年的卡尔·阿伦（金·凯瑞饰）虽然衣食无忧，但他的人生可谓失败透顶。三年前和妻子离婚，始终过着单身生活。生活中他拒绝和他人交往，反而更愿意窝在家里看电影。在朋友的建议下，卡尔来到一家名为“好好先生”的机构作咨询，在导师泰伦斯（特伦斯·斯坦姆普饰）的指引下，他尝试对生活中每一个问题都以肯定的方式回答。这小小的改变令卡尔的人生天翻地覆，正当他信心满满之时，却发现人生并非像他想得如此简单……

Desperate to experience true emotion, a young woman, CARYS, regularly attends the funerals of strangers. But she's unprepared for the secrets she must keep and the lies she must tell when, at one fateful wake, she falls for TYLER, who is mourning his fiancée. As Carys allows herself to experience love for the first time, she begins to fear that perhaps her fascination with death might lead to her own untimely demise...