Mercy Among the Children is one of my favourites of his, but River of the Brokenhearted and Incidents in the Life of Markus Paul also earned 5 stars from me.
I’ve already posted reviews of three of Richards’s books:
Principles to Live By: http://schatjesshelves.blogspot.ca/2016/06/review-of-principles-to-live-by-by.html
Crimes Against my Brother: http://schatjesshelves.blogspot.ca/2016/12/canadian-book-advent-calendar-day-18-r.html
Incidents in the Life of Markus Paul: http://schatjesshelves.blogspot.ca/2015/07/from-schatjes-reviews-archive-incidents.html