Originally, Clyde Shelton (gerard butler) is a happy family man and a beautiful wife.

And his lovely daughter formed a happy family of three, until all his family members were brutally killed by gangsters in a burglary, and Clyde felt that his whole world had collapsed. Subsequently, after careful investigation and evidence collection, several murderers were arrested one after another, and a successful and confident Philadelphia prosecutor Nick Rice (Jamie Foxx) was in charge of the case ... In view of the special circumstances of the case, Nick provided an opportunity for one of the suspects, and if he was willing to be a tainted witness, he could get a lighter punishment.

Soon, 10 years passed, and this lenient criminal was suddenly murdered ... Clyde coldly admitted that he was the murderer, and then issued a warning and declared war to Nick in his cell: if he continued to try with flawed justice, he would lose his family like himself, and all the main suspects in that case must accept the fate of death.

Clyde immediately began to carry out his threats and arranged a series of devilish assassination plans in his cell without any warning or protection. The contagious fear caused by Clyde spread to every corner of Philadelphia as quickly as possible, especially when he slaughtered the targets one by one with a bright high profile. It seems that the so-called authority has become so powerless in front of him that no one can stop the chaos created by Clyde.

There are indications that only Nick can make the serial killings come to an end, and he must defeat Clyde, a murderer who has caused great harm to social security-there is a fierce competition between them in willpower and determination, and even the slightest mistake may ruin his life. When Nick found Clyde's fierce eyes on his beloved family, he was forced into a desperate race against time. He needs to face the most dangerous opponent in the world, because this person seems to seize the opportunity every time and always walk in front of himself.