The second edition of "Count Down" is revised to include and discuss developments affecting the Big Four and their business model since the December 2015 release of the first edition. Brought into this updated narrative, for example, are: The Big Four's growth to collective global 2016 revenue of $ 128 billion, and the continued disparities in growth between their Audit and Advisory practices. The imposition of mandatory auditor rotation by legislation and regulation in the European Union, and in the US, the PCAOB's requirement to name lead partners on public company audits. New examples of corporate financial malfeasance and potentially disruptive auditor litigation, involving clients of each of the Big Four. In addition, this new edition expands in scope and details the required re-engineering by which - with the necessary mutual cooperation among financial statement issuers and users, the accounting profession, legislators, regulators and agencies of law enforcement - a sustainable structure for financial reporting and assurance might emerge -- that is, a Big Audit model truly fit to serve today's global capital markets.