Lucie and her husband Samuel Carrera are celebrating their wedding at the Auberge du Lac de Guéry in the Auvergne mountains in France when lightning strikes them and five others. Samuel is killed instantly. The others survive but become 'lightning-struck,' with strange aftermaths that disrupt their lives. Lucie gains an exceptional memory capacity, remembering every moment of her life, a faculty that prevents her from overcoming her trauma and grieving. Two years later, the Miraculous from the "Lac de Guéry" meet again at the scene of the tragedy. Supported by her companions of misfortune, Lucie has decided to scatter Samuel's ashes. But then a mysterious killer begins to eliminate them one by one. Major Julien Eider of the Clermont Regional Police leads the investigation, stunned by Lucie's hypermnesia and precious assistance.