As members of SpecFicNZ Matt has written two stories and Debbie one in the anthology, which in their words is "funny, emotional, cynical and moving".
Spanning many topics, the anthology is a collection of short works featuring short stories and poems from around 20 New Zealand authors.
"The book hosts a pretty broad range, with particular interest in horror, fantasy and science fiction but with that New Zealand flavour," Matt said.
"There really is something for everyone.
"Growing up there was a bit of prejudice against horror and fantasy fiction from some people, so I've got a lifelong chip on my shoulder.
"I have something to prove, that speculative fiction can be good, is literary and is worthy."
Today speculative fiction is very popular, with some of the highest grossing movies and television shows being super hero films, horror and fantasy.
The popularity of Stephen King, Harry Potter, Twilight and DC Comics to name a few have all added to the growth of the genre in recent years.
"SpecFic has a growing audience in New Zealand, however a lot of the time people are reading SpecFic that is from overseas," Debbie said.
"When people first get into this genre they see the more mainstream books and movies and the big international names and then after that might find out about the more local ones."
Being published authors and having a successful 'hobby' on the side is not a distraction from the Cowens' day jobs.
"We are equally passionate about teaching writing and actually writing ourselves," Debbie said.
"It keeps reminding you what the challenges are, and we can pass that onto the students.
"There are plenty of opportunities to use creative writing in the classroom, teaching and writing is a nice fit, but it's very much a hobby."