The Arthur Ellis Awards are for CRIME WRITING, and are not restricted to mystery writing. Crime-writing encompasses far more than the traditional whodunit. The crime genre includes crime, detective, espionage, mystery, suspense, and thriller writing, as well as fictional or factual accounts of criminal doings and crime-themed literary works.
The winner for best crime novel in 2017 is The Fortunate Brother by Donna Morrissey. I loved this book; see my review at http://schatjesshelves.blogspot.ca/search?q=the+fortunate+brother.
For all the winners in the various subcategories, go to http://www.crimewriterscanada.com/awards/arthur-ellis-awards/current-contest/winners.