When a well connected journalist gets double-crossed by a damaged and psychologically abused terrorist, she must find a way to stop her before she releases a biological weapon on an unsuspecting city.

“When a journalist gets double-crossed by a terrorist seeking power, She must figure out a way to stop her before civilisation is destroyed.”

What specific event? What does the terrorist do to double-cross her? What is the terrorist’s goal that the journalist must stop? And why not just call the cops?
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The inciting incident doesn’t create motivation for the protagonist to pursue her goal. What about this betrayal makes her have to stop a terrorist? Why not the cops? Why would the terrorist want to destroy civilization?(In other words, it sounds like a one-note villain who is just evil so the protagonist has someone to punch when the time comes.)