Discover the hidden origins of Christmas in The Claus Universe, a genre-bending blend of sci-fi, fantasy, and dark mythology.

In Claus: Legend of the Fat Man, Nicholas Santa disappears into the Arctic and awakens beneath the ice among an ancient race of elves—just as rebellion ignites and a bitter outcast named Jack rises to power.

Jack: The Tale of Frost follows Sura, a grieving girl drawn to the haunted Frost Plantation, where shifting towers and mechanical ghosts conceal a genius who may have invented Christmas—and unleashed something not human.

In Flury: Journey of a Snowman, young Oliver uncovers his family’s eerie secrets and a sentient snowman born from forgotten magic.

Three stories. One universe. The truth behind the legend.

Christmas Presence: Prequel to the Claus Universe Series (A Science Fiction Adventure)
by Tony Bertauski
4.7 Stars (37 Reviews)

FREE for a limited time

Van just wanted to survive a Christmas party, not get trapped in a virtual world full of clockwork toys, droids in Santa suits, and glitching magic. Now he and Charli must escape a war between belief and machinery before reality itself short-circuits.

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Claus : Legend of the Fat Man (A Science Fiction Adventure) (Claus Series Book 1)
by Tony Bertauski
4.4 Stars (3,466 Reviews)

Before the red suit and reindeer, there was the man who survived an elven civil war. When Nicholas Santa vanishes in the Arctic and discovers a hidden race beneath the ice, he’s thrust into a battle between myth and rebellion. Claus: Legend of the Fat Man is the origin story you never saw coming.

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Jack: The Tale of Frost (A Science Fiction Adventure) (Claus Series Book 2)
by Tony Bertauski
4.4 Stars (508 Reviews)

Sura never believed in fairy tales. Until she took a job at Frost Plantation, where towers vanish, machines whisper, and the boss might’ve invented Christmas. When a centuries-old experiment named Jack escapes, she’s pulled into a dark legend where science meets snow. And Christmas fights back.

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Flury: Journey of a Snowman (A Science Fiction Adventure) (Claus Series Book 3)
by Tony Bertauski
4.7 Stars (347 Reviews)

When Oliver moves into his grandmother’s eerie mountain estate, he uncovers lost journals, a pulsing wooden sphere, and a secret buried in the snow. Something ancient is watching from the forest—and the legend of a snowman is about to come to life.

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Humbug : The Unwinding of Ebenezer Scrooge (A Science Fiction Adventure) (Claus Universe Book 4)
by Tony Bertauski
4.4 Stars (400 Reviews)

Tech mogul Ebenezer Scrooge built the world’s most powerful AI. And lost his humanity in the process. When his late partner’s digital ghost sends two mysterious girls to his fortress on Christmas Eve, Scrooge faces his greatest algorithm yet: learning what it means to be human.

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