The story is set on Midsummer’s Eve, when the mysterious military unit takes over a peaceful seaside town. All data networks are disrupted, and the region falls silent. The motives and the origin of the enemy remain shrouded in mystery, with the whole of Europe being taken by surprise and under shock. Local residents turn into hostages, including 21-year-old Annika Berg, who is...。一本奇书,一个背影……因为种种巧合,学数学的男生郝欣桐遇上了学历史的女生白灿然。一本旧书上的两种笔记,成为历史和现在的交汇点,他们沿着蛛丝马迹,苦苦追寻五四时期的一段真相。而正当一切就要豁然开朗时,白灿然却突然选择了放弃。那本笔记背后究竟有着怎样的秘密?郝欣桐和白灿然又会有怎样的结局?。