艾米莉·德奎恩

　Astrid Nielsen, works in the library of the judicial police. Suffering from Asperger's syndrome, however, she has an incredible memory, so she is very useful in analyzing the files for ongoing investigations. The district commander, having noticed this ability, decides to use it to the fullest, entrusting her with very complex investigations which have remained unsolved to date. In addition, also to reciprocate, he will try to help Astrid on the behavioral side, in order to provide mutual help.

故事围绕两个13岁的男孩展开，他们的关系长久以来非常亲密，但同学之间对他们的关系产生猜忌，使他们不得不分道扬镳。而当一场悲剧发生时，其中一个男孩被迫面对他为什么与他最亲密的朋友疏远。

该剧描述一个五岁的小男孩2006年随父母去法国旅游时神秘失踪，八年之后人们确信他已经死亡，但他的父亲仍留有一丝希望。该剧同时存在两条时间线（2006年和2014年）——天涯小筑