With a far-future setting merging Chinese and American culture, 'Firefly' also saw high-tech futurism blended with the traditional Wild West.
There are plenty of genre-crossover books, films, and games out there, but to do the job well, you have to do more than just smoosh a couple of 'in' concepts together, and hey presto, instant millions.
In its brief 14-episode run, 'Firefly' gave viewers as much chance of witnessing a horseback chase or train robbery as a laser gun and spacefight in any given episode. Snappy one-liners and silly hats were a constant, of course.
There's a fairy story called the 'The Shoemaker and the Elves' where this old cobbler keeps leaving leather out overnight and wakes up the next day, and there's a new pair of shoes. Co-authoring is a little like that. You send off the manuscript to your partner, and a few days later, you check your email, and hey, there's more book in here!
You tend to find the best in yourself as an artist when you're challenged.