Check out the list of released books and short stories available now or coming soon! Most books are or will be available from major book retailers. If anything has limited distribution, the summary will mention it.

NOTE: I am an Amazon affiliate so if you buy anything from them using the links below, I might receive a commission someday.

Released Books and Stories


Super by Karen Diem - Arca Book 1

Adrenaline junkie and almost-respectable accountant Zita Garcia wouldn’t know a superhero from some dude in his pajamas. As a result, the second-to-last thing she expected was to wake from a spontaneous coma, quarantined, and with super powers she has to hide from everyone, including her family. Now Zita must master her new abilities while dodging kidnappers, evading government inquiries, and finding her missing brother.

The only thing weirder would have been if the blind date had gone well.

Super is the first and pilot episode in the Arca superhero urban fantasy series, so includes both the “origin story” of her powers and her first adventure(s) using them. It also contains immoderate language, lame sexual innuendo, and comic book violence. Available in both paperback and ebook formats.

Washout: A Short Story from the Arca series of superhero urban fantasy books


Sneaking out of quarantine, Zita and Andy try to unwind and practice their new powers in an isolated corner of Arizona. However, neither Mother Nature nor their fellow man is going to go along with their plans for a quick, uneventful trip.

This is an approximately 4,000 word short story set between Super chapters 10 and 11, and is only available to newsletter subscribers.

Octopus: An Arca Short Story cover


Bite-Sized Stories: A Multi-Genre Flash Fiction Anthology (Flash Flood #1) cover

All Zita wanted was dinner, but what she got was trouble. 

Octopus is a “flash fiction” (extremely short ~1000 words) story, and occurs between the events of Super and Human. No hentai. It includes comic book violence, justifiable swearing, and a grumbling stomach.

This story is part of Bite-Sized Stories: A Multi-Genre Flash Fiction Anthology (Flash Flood #1), available for free. While weighted heavily toward sci fi, fantasy, and horror, a couple of other genres are also available in this volume.

Get  a copy on: Amazon      iBooks     Kobo     Barnes & Noble     Google Play       Smashwords


Human - Karen Diem - Arca Book 2 - Superhero Urban Fantasy

Death? Acceptable risk. Taxes? No problem. Ancient magical cutlery of mass destruction? Bad, very bad.

Following a brief foray into the world of superpowered vigilantism, extreme sports enthusiast and halfhearted tax preparer, Zita Garcia, wants her old life, her shiny new abilities, and none of the consequences. She’s even willing to hide her powers since the alternative means endangering her family and living life as a literal lab rat.

Unfortunately, villains are searching for the pieces of a decrepit magic dagger, hurting innocents and fueling nasty anti-super protests. Her close friends, who helped before, are barely speaking to her, and one of them stands in the path of the violent hunt for the knife.

Zita better dig out her mask—fast.

Human is the second in the Arca superhero urban fantasy series and contains immoderate language, lame sexual innuendo, and comic book violence. While Human can be read as a standalone, it includes minor spoilers for the first book in the series. Available in both  ebook and paperback formats.


Tourists by Karen Diem

When possible extraterrestrials invade the Las Vegas Strip, it will take superheroes to stop them. Even if those superheroes are neophytes.

This is an approximately 10,500 word short story set after Human, and is only available to newsletter subscribers.



Karen Diem - Power - Arca Book 3

After successfully rescuing her brother from a serial killer and stopping a plot to use a magic butter knife to massacre thousands, Zita Garcia is ready for a return to her regular life: illegally climbing skyscrapers, hiding her superpowers, and grudgingly earning a paycheck to cover all those bills piling up.

Unfortunately, her least favorite supervillains are rampaging around in a bloody crime spree, outmaneuvering and outgunning the authorities. Enlisting her friends to help, even the one sulking in his dad’s basement, she’s got to stop the bad guys and their latest evil plan before anyone else dies. Even if Zita isn’t sure what they’re doing, other than it involves Brazil.

And maybe dinosaurs.

Power is the third in the Arca superhero urban fantasy series and contains immoderate language, lame sexual innuendo, and comic book violence.


Karen Diem - Pie

While on a multi-day road trip, Zita has to deal with a cranky brother and a rampaging pink monster, armed only with her wits and some pie. Or at least the pie.

This short story is set after Power and is only available to newsletter subscribers.



Roses in December

Roses in December, an Arca World story by Karen Diem. Cover has a masked woman with magic in her hand.

 When her aunt with dementia is taken on a disastrous day trip, research librarian Wyn will have to step out of the stacks and get down and dirty to save her.
Even if  it means hiking.

This short story occurs after Pie and is only available to newsletter subscribers.



Monster by Karen Diem

Tax season. It’s all forms and games until someone loses a murderer.

Authorities have abandoned the search for a sadistic serial killer with a grudge against Zita Garcia’s family. Never one to sit still, the sometime superhero and reluctant tax preparer will do whatever it takes to find him.

With her loved ones at stake, she’ll call in her best friends and questionable new allies to help. If finding her quarry means Zita has to fight literal monsters, wrangle glitter-obsessed vampires, or go to a nightclub, she’ll do it. Even if the undead and line dances make her skin crawl. She needs to get her mask on and solve this fast—before things go from bad to hearse.

A shovel to get through the three feet of snow wouldn’t hurt either.

Monster is the fourth book in the Arca superhero urban fantasy series and includes immoderate language and comic book violence.

Upcoming Books and Stories

TogaToga - Arca Book 5 - By Karen Diem

Book 5. You won’t want to myth this one.