Even before she could write, Karina strung tall tales about everything from making human pyramids in Kindergarten to visiting alien worlds.  Her first attempt at novel writing was in fourth grade; she completed her first novel in college.  However, her first published work was an anthology of Christian science fiction, Leaps of Faith, an EPPIE finalist for best anthology in 2006.  Her next anthology, Infinite Space, Infinite God, featured Catholic characters and themes and won the EPPIE for science fiction.   The second Infinite Space, Infinite God anthology came out in 2010.

Watching the comedy improve show, Whose Line Is It, Anyway, inspired her noir-style dragon detective, Vern.  Vern and his partner, Sister Grace, have solved mysteries and saved the Faerie and Mundane worlds numerous numerous times in the DragonEye, PI stories and novels.  Their serial story, World Gathering, won a Mensa Owl; and the novel, Magic, Mensa and Mayhem (Fabian's first published novel), won the INDIE for best fantasy in 2010.

At a friend's request, Karina wrote a funny story about a zombie exterminator, which grew into the Neeta Lyffe, Zombie Exterminator novels.  The first, Neeta Lyffe, Zombie Exterminator, won the 2011 Global E-Book award for best horror.

She also writes serious science fiction.  Her first SF novel, Discovery, is currently under consideration, and she's working on a second on, The Old Man and the Void, based loosely on Hemingway's The Old Man and the Sea, but taking place in the accretion disk of a black hole.

Karina has a strong faith, which she explored in her devotional, Why God Matters: How to Recognize Him in Daily Life, which she wrote with her father Steve Lumbert, and which won the 2011 Christian Small Press Publisher Award.  She also writes Catholic school calendars and has written three craft books for the Little Flowers/Blue Knights clubs.