在以最小空间容纳着最复杂社会关系的监狱，犯抢劫罪入狱、刑期过半的罪犯宁东来虽极力把自己裹藏在厚茧当中，但其诸多异常逃不过第一监区教导员荣光的“法眼”，一场没有硝烟的战斗在号称“火山口”“炸药库”的监狱不动声色上演。监狱人民警察点顽石成金玉，化腐朽为神奇，将智勇之间的度把握得炉火纯青。救赎最后，宁东来坦白了一个隐藏多年的巨大秘密……影片改编自陕西某监狱真实案例，由监狱人民警察和服刑人员自编自导自演自制，全实景拍摄。

In a prison which is the narrowest space crowded with criminals of the most complicated social relations, a criminal, Ning Donglai, was convicted of robbery and had served half of his sentence, he did his utmost to hide himself inside a thick cocoon, yet, quite a few of unusual signs could not escape the alerting eyes of Rong Guang, a political instructor of ward No.1, a war without smoke of gun silently played out in this prison which is known as volcanic vent or explosive warehouse. How the people police in the prison touched the stone and changed it into gold, turn the foul and rotten into the rare and ethereal, and perfectly balanced between wisdom and bravery. In the end of the redemption, Ning Donglai confessed a huge secret hidden for years...the movie is adapted from a real case in a prison in Shangxi Province, and scripted, directed, played, produced by the people’s polices and persons serving sentences in the prison, all shooting in real locations.