i am in collaboration with a friend who wants to write. she is obsessed by crime and like a lot of australian girls seem to read a lot of true crime books. 
i suggest two characters  her and me, the female is a hard drinking, hard fighting, hard talking aggressive alpha female who possesses all the qualities of a male whereas i am the quiet bookish introspective loner. more female. 
the inversion of roles goers against every modern drive in fiction, especially as the female is a husband basher.
my writing partner will write the crime scene. i will add some flourish and conversation to introduce the main characters. 
let's see how we progress.