In the aftermath of the 1995 referendum on Quebec unilateral secession, 1 the then Minister of Justice, Allan Rock, proposed that the legality of a province's attempting to secede unilaterally be referred to the Supreme Court of Canada for a judicial opinion, pursuant to that Court's special advisory jurisdiction.2 Accordingly, on 30 September 1996, the Governor General in Council submitted three questions of law, discussed in detail below, concerning the legal authority of Quebec, under both Canadian and international law, to secede from the Canadian federation. In addition to the government of Canada, two provinces, the two territories, and a number of special interest groups and individuals (all given leave to intervene) submitted written arguments and rejoinders over the course of 1997.3 The government of Quebec did not participate in the hearing and submitted no argument. Accordingly, the Court appointed an (from Quebec) to represent the secessionist interest. The Court heard argument from 16 to 19 February 1998. On 20 August 1998 the Court released its unanimous opinion, rather earlier than expected.4 The Court rejected the legal right of Quebec to separate unilaterally under Canadian constitutional law, and the right to do so under international law as recognised in Canada. Given the latter holding, the Court did not consider further the third question relating to reconciling a possible conflict between the two legal orders. The following extended case comment proposes to outline and discuss briefly the reasoning of the Court, in what is a significant exercise of judicial power in the service of constitutional affairs. The structure of this comment will follow that of the Court's resaoning, dealing first with a preliminary objection, then turninh to question 1(introduction and discussion) and then to Question 2 and 3.5