Rework: When a witness and two cops are killed, a tenacious Homicide Detective must defeat his contract-killer nemesis to capture the unknown mastermind.

"When a witness and two cops are killed, a tenacious Homicide Detective must defeat his contract-killer nemesis to capture the unknown mastermind."

What is it the witness witnessed? Why were they important enough to have two guards and to be sought out and murdered? And if this mastermind is the one who the witness witnessed doing something worth killing them over so they can't testify, how is this mastermind unknown? How does defeating a contract killer lead to the mastermind?

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