Updates

New release & ebook availability

Watcher is available now; six ebooks are on Google Play

The Invariant: Watcher — A Coda to The Invariant was published September 6, 2026 and is available on Amazon as a $2.99 Kindle ebook and $12.99 paperback.

Cradle, Passenger, The Uncovered Past, Singularity, Cosmic Light, and Nightmare Between Worlds are now also available as $2.99 ebooks on Google Play. Watcher is not yet listed on Google Play.

The Invariant

Cosmic Light is available now; Watcher is in development

The Invariant: Cosmic Light, Book Five of The Invariant, was published August 6, 2026 and is now available in Kindle and paperback editions.

Cosmic Light concludes The Invariant's main arc. Book Six, Watcher, follows as a coda to The Invariant and is currently in development. Release details have not yet been announced.

Destinies

The Destinies universe is now on the site

The Destinies section introduces the three-novel sequence currently in development: Destinies Begin, Destinies Lost, and Destinies Found. It also introduces Ro and Lilith and provides two free, non-canon companion comics that remain separate from the main novel storyline.

Website

The official Linus Jacobs website

The official Linus Jacobs website is now live, bringing together current releases, reading order, individual book details, Amazon purchase links, author information, and future announcements.

The Invariant Books One through Five and Nightmare Between Worlds are available now. The five numbered releases form The Invariant's completed main arc, while Book Six, Watcher, is a coda currently in development. The site has also expanded to include the developing Destinies novel sequence and its free non-canon companion comics.