Following on from the critically acclaimed Disunited Kingdom: How Westminster Won A Referendum But Lost Scotland, Iain Macwhirter casts his expert eye over the SNP's victory in the 2015 General Election, which saw Scotland swept by an unprecedented wave of yellow.One of the UK's most insightful political writers, Macwhirter examines the factors behind this result including the demise of the Labour Party in Scotland, Nicola Sturgeon's SNP vision and leadership, the growing dissatisfaction with Westminster, and the enduring passion for independence. Tsunami ends with Macwhirter looking forward to ultimately consider where Scotland, and the UK, must go next.