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.

托马斯（莱奥·勒格兰德 Léo Legrand 饰）年过五十，一次机缘巧合之下，他回到了阔别已久的家乡，让他没有想到的是，自己竟然意外的穿越回了四十年前，衰老的灵魂回到了年轻的身躯之中，记忆深处似曾相识的回忆和景象如今一一栩栩如生地展现在了托马斯眼前。　　就这样，托马斯得以重新见到了母亲安娜（亚历山德拉·玛丽亚·拉那 Alexandra Maria Lara 饰）和父亲布鲁诺（乔纳森·扎凯 Jonathan Zaccaï 饰），久别重逢的喜悦平静之后，他决定做一件他早就想做的事情。曾经，布鲁诺抛弃了安娜，而这一次，托马斯要利用这个千载难逢的机会改变这一历史。然而，无论怎样努力，父亲还是离开了，但是，这一次，托马斯终于知道了父亲做出这一选择的真正原因。