Cairns does an excellent job covering some of the major constitutional developments in Canada during the 1980s under both Trudeau and Mulroney. In particular, he effectively outlines the ways in which the Charter became immensely popular in the years after its inception, engendering a sense of ownership between newly-empowered groups and the Charter. This would be of crucial importance in understanding why the Meech Lake Accord had been opposed with such hostility by many of these same groups, given that it was essentially the product of efforts to placate Quebec, using the top-down premiers' amending formula from 1982.
A good summary of many then-contemporary issues, some of which are live today.