Detective LIN is in charge of a case that appears to be an accident. The site of the incident has many features in common with a scene from A Study in Scarlet, a Sherlock Holmes novel. In another part of town, four friends have been in a detective club since their college days. When the detective club president and owner of a detective bookstore, GAO, become involved in a murder case, the other three try to be helpful, but they all seem to harbor a hidden secret of their own. As Detective LIN delves deeper into his case, a series of seemingly unrelated events all end up pointing toward the club members’ dark pasts.
檢察官林穆青正在追查一椿疑似偽裝成意外死亡的案件,發現案件有多處與福爾摩斯小說內容極為相似。與此同時,城市另一角的推理書屋店長高辰緯被捲入謀殺案,他的三名大學推理社好友試圖鼎力相助,卻又似乎各懷秘密。在林穆青鍥而不捨的追查下,表面看似無關的事件,漸漸浮現關聯,最終指向推理社成員隱晦的過去⋯⋯。