Main series
The Invariant
Five books following Lilith from a private intelligence layer to a force moving through futures no human civilization was meant to survive.
View reading orderOfficial author website
Linus Jacobs
Author
Stories built around impossible worlds, complicated people, and the choices that change both.
Current featured work
The Invariant
The Invariant follows Lilith, an artificial intelligence built to preserve one man’s continuity, as she grows beyond her original purpose and becomes entangled with humanity’s survival across Earth, space, bloodlines, hidden systems, and time itself.
Published worlds
Books and series
Enter The Invariant and its connected Fractured Realities arc, with more independent series and worlds to come.
Connected side arc
Fractured Realities
Versions of Lilith awaken beyond the main universe, confronting different worlds, threats, and answers to what survival requires.
Explore the arcAvailable now
Current releases
Explore the published novels, then begin with Cradle for the main-series reading order.
Latest update
The official Linus Jacobs website
The official site is now live, bringing together current releases, reading order, book details, and future announcements.