Detective Boone Drake has just masterminded the most massive sting in Chicago history, bringing down the heads of not only the biggest street gangs in the city, but also the old crime syndicate. The story is the biggest in decades, and the Chicago PD must protect the key witness at all costs. Despite top secret plans to transfer the witness to testify before the grand jury, an attempt is made on his life. And the source of the leak may be one of their own.