I know it is bandied about way too much--eveything seems to be labelled a classic within minutes--but I honestly forsee Unity becoming a Canadian classic. Mark my words, your kids will be studying this in highschool at some point. It's a universal story with gorgeous details and characters so real they slap in you in the face.
I haven't had the opportunity to see a production of this, but if one comes to my city (please!) I'm going to rush out an see it.
I strongly, highly, deeply recommend this book!