Check out this quote from the Resource Links review from October 2017:
The Shepherd family is a joy to follow, and Charlie is a real wild card with lots of interesting back story yet to reveal. Although this novel appears long, Counios & Gane have mastered the art of the short chapter, and Shepherd’s Watch is a very quick read. This novel has enough suspense, humour and gore to keep teens turning the pages.
From their website, Resource Links is a "Canada's national journal devoted to the review and evaluation of Canadian English and French resources for children and young adults...written by educators and librarians working with young people across the nation..."