Zooey and Alec Morrison are a married couple who are struggling to bridge the painful gap that is developing between them. Unable to conceive, the Morrisons await confirmation of a child to foster. One day, a seven years old boy who calls himself Eli appears on their doorstep quite mysteriously, explaining the foster agency has sent him. The boy is old beyond his years and it becomes apparent that he is the listening ear amongst the couple's marriage breakdown. Eli offers moral support and idealistic suggestions to his foster parents on how to repair and re-kindle their love for each other. The couple begin to rebuild their foundations at home, at work and emotionally until they find the love they once had for each other. But all may not be as it seems... 当天使来敲门。 佐伊（托妮·科莱特 Toni Collette 饰）和亚力克（艾恩·格拉法德 Ioan Gruffudd 饰）结婚多年，但是因为佐伊无法怀孕，所以两人迟迟都没有孩子，这成为了这个家庭一个无法愈合的伤口。夫妻两人来到领养机构登记，想要领养一个孩子，几天之后，一个名为伊莱（Maurice Cole 饰）的七岁小男孩带着他的行李箱敲响了佐伊家的房门。 就这样，伊莱成为了佐伊和亚力克的孩子，但是夫妻两人之间岌岌可危的关系却并没有因为伊莱的到来而有所缓和。聪明的伊莱察觉到了家庭里微妙的气氛，于是开始着手修复养父母之间的关系。在伊莱的调解之下，佐伊和亚力克消解了心结，但之后他们发现，伊莱的身份并没有他们想象的那么简单。
