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。