The Ninth Variable: A Kaye Carter Series

By Samantha Campbell

She is the variable no equation can solve.

Kaye Carter is a systems architect at Carter-Voss, the most powerful predictive-intelligence company on earth - until a leaked video frames her for breaching her own vault, and the Board that raised her puts a price on her head.

On the run with Adrian Wolfe, the head of security who may be her only ally, Kaye follows a trail her murdered parents left behind: a cabin in the Cascades, a glass fortress that wakes when she touches it, and a dead zone where the world's surveillance cannot see her.

Because the Board isn't hunting her for what she stole.
They're hunting her for what she is.

The Black Ledger - the source code of a machine that predicts every human choice - isn't a file. It's inside her. Her mother built it. Her father died for it. And Silas, the man who has been waiting since the night she was born, will burn the world to take it back.

To survive, Kaye must master the frequency in her blood: to hide, to heal... and to compose a counter-signal that could break the machine - or become it.

THE NINTH VARIABLE is the explosive first book in a new sci-fi conspiracy thriller series. Perfect for fans of Blake Crouch, Daniel Suarez, and the Bourne novels.

• Format: Paperback
• Language: English
• ISBN: B0HLXSY9TM
• ISBN13: 9798178512159
• Release Date: October 2026
• Publisher: Independently Published
• Length: 180 Pages
• Weight: 0.50 lbs.
• Dimensions: 0.5" x 6.0" x 9.0"