Dylan, Natalie, and Alex are three talented women currently at the employ of the unseen "Charlie", who gives them cases to investigate via a speaker in his offices, and backing them with support for disguises and equipment; Charlie is assisted by Bosley who helps the women directly when needed. They are assigned the case of the kidnapping of Eric Knox, a programmer and head of Knox Enterprises, supposedly by a company called Redstar for his voice tracking and identification system. The three women infiltrate a party held by Redstar's owner, Roger Corwin, and spot a thin man that was seen on the surveillance videos during Knox' kidnapping. They give chase, and eventually corner and fight the thin man, but he runs off; when the women follow, they discover Knox.

After reuniting Knox with his partner Vivian Wood, Knox implores them to help understand what Redstar would do with his software. The three manage to infiltrate Redstar's secure computer system and plant a device to allow them to explore the Redstar mainframe at their leisure. They leave the laptop with Bosley and consider the mission successful. The group relaxes for the night, with Dylan taking up an offer to spend the night with Knox. However, Dylan discovers that Knox had planned the events all along with help from the thin man and Vivian; by gaining access to Redstar's server, he is able to seek out the location of any voice that can be detected on it. Knox shoots at Dylan, believing to have killed her, though Dylan is able to escape unharmed. When she regroups with Natalie and Alex, she finds they have also been attacked but each escaped, that Corwin has been murdered, and that Charlie's offices have been blown up. They learn from a radio transmitter implanted in Bosley's teeth that he is unharmed, captured by Vivian before the explosion, and are able to use information to target his whereabouts.
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