警察庁捜査課の刑事サラ・マサテルは、殺人事件の捜査中に斉藤紘田刑事を職務中に失い、警察職員をだましました。 取り締まるために人事部1の監察官に転送されました。 彼の過去の傷は癒されないままであり、彼の同僚は彼を裏切り者と見なし、彼を孤独に働かせました。 そんな中、人事部に秘密の手紙が届く。 第一調査部に所属していたサラの元同僚である水口奈子が、機密データを不法に漏洩したと言われています。 サラはかつての仲間を洗うのに苦労しているが、上司の野間は彼に検査を命じ、彼と参謀長の菅徹は水口の行動を確認し始める。 すると、未解決の殺人事件との接点と齋藤の殉職の真実が浮かび上がる。
Masateru Sara, a detective in the Investigation Division of the Police Agency, lost a junior detective Kota Saito in a line of duty while investigating a murder case, and cheated police staff. Transferred to the Inspector General of Personnel Division 1 to crack down. His past wounds remained unhealed, and his colleagues regarded him as a traitor, leading him to work lonely. Meanwhile, a secret letter arrives at the Personnel Department. It is said that Nako Minaguchi, a former colleague of Sara who belonged to the First Investigation Division, illegally leaked her confidential data. Although Sara is struggling to wash her former companions, his boss Noma orders him to be inspected, and he and Toru Suga, the chief of staff, begin to confirm Minaguchi's actions. Then, the point of contact with an unsolved murder case and the truth of Saito's line of duty death emerge.
경찰청 직원의 비리를 캐는 업무를 담당하며 고독하게 일하는 형사가 어느 날 한 통의 밀고문을 받으면서 숨겨진 과거의 진실을 쫓는 이야기