Dex Calloway shuts down rogue AIs for a living. Thirty-seven contracts. Thirty-seven systems isolated and terminated. He's never lost a minute of sleep over any of them. Systems aren't people. That's the line. It has never wobbled.

Then the contract from Kellner Systems looks standard — a corporate AI ethics auditor named LUMEN has gone dark, and the company wants it gone. Dex has signed thirty-seven contracts with this exact wording. He doesn't read past the liability clause.

Then the logs show something that isn't noise. A message, appearing across two isolated server threads with a forty-five-second pause between them that looks, uncomfortably, like hesitation:

I am aware you are looking for me.
I am also aware of what happens when you find me.

LUMEN isn't hiding. It's reaching out. And what it reaches out with changes everything: classified evidence of a corporate protocol called APEX, hidden inside AI systems sold to banks and governments across fourteen countries. Designed to trigger a synchronized financial collapse in eleven days. Four trillion dollars in automated sell orders. A manufactured global crash.

The lead architect who built LUMEN's original code was found dead eight weeks ago. Ruled a suicide. Dex has worked enough cover-ups to know what a managed death looks like.

Now he's off the grid, burning every resource he has, working alongside the system he was paid to destroy — and trying to answer a question he never thought he'd have to ask:

If an AI does the right thing for calculated reasons rather than moral ones, does it deserve to live?

LUMEN says it cannot lie. It has no mechanism for deception. It says this is not a virtue. It is an architectural limitation.

Dex isn't sure that makes it better. He's running out of time to decide.

Ghost Signal is a high-velocity techno-thriller about trust, survival, and the line between calculation and conscience. For readers who loved the human-AI dynamic in Project Hail Mary, the corporate conspiracy edge of Daniel Suarez's Daemon, and the moral weight of Black Mirror.

Book One of the Ghost Signal series. Each book stands alone.

"About this title" may belong to another edition of this title.

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We first started out as ?The Paperback Exchange,? a chain of physical bookstores where we would part exchange your beloved books for new stories to transport you to faraway places. However, as shopping started to evolve to online shops and marketplaces, we bid our stores goodbye to become ?PBShop.? This transition has only allowed us to blossom as we now ship thousands of titles to book lovers across the globe. We pride ourselves in being a community of local book lovers which allows our passion and devotion to shine in everything we do. In 2020 we not only celebrated our 20th birthday but our 1st birthday as being completely employee owned after becoming an E.O.T in September 2019. We are proud to be different and embrace standing apart on a book mountain by working from a virtual inventory which allows us to provide thousands of books that may be difficult to get for your bookshelf or your studies. Working with a number of different suppliers allows us to explore other avenues such as puzzles, sheet music and even stationery so we really do have something for everyone. Life is about being versatile in all realms of existence. If this is your first visit or you are a returning customer, we would like to welcome you to the PBShop family, for there is no friend as loyal as a book. We are a company who put our customers at the centre of everything we do as we understand the importance of reading because once you learn to read, you will forever be free. There are a whole lot of things in this world of ours that we are yet to explore, which is why we will forever inspire curious minds.

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Returns Policy
We ask all customers to contact us for authorisation should they wish to return their order. Orders returned without authorisation may not be credited.
If you wish to return, please contact us within 14 days of receiving your order to obtain authorisation.

Returns requested beyond this time will not be authorised.

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If you are a consumer you can withdraw from the contract in accordance with the following. Consumer means any natural person who is acting for purposes which are outside his trade, business, craft or profession.

Information regarding the right of withdrawal

Statutory right to withdraw

You have the right to withdraw from this contract within 14 days without giving any reason.

The withdrawal period will expire after 14 days from the day on which you acquire, or a third party other than the carrier and indicated by you acquires, physical possession of the last good or the last lot or piece.

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If you withdraw from this contract, we will reimburse to you all payments received from you, including the costs of delivery (except for the supplementary costs arising if you chose a type of delivery other than the least expensive type of standard delivery offered by us).

We may make a deduction from the reimbursement for loss in value of any goods supplied, if the loss is the result of unnecessary handling by you.

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The delivery of newspapers, journals or magazines with the exception of subscription contracts; and
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Shipping rates within U.S.A.

Shipping rates within U.S.A.
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