There’s a ubiquitous template for many contemporary novels and it goes something like this: “an inspiring story of an oppressed protagonist who overcomes all odds and discovers herself.” Anna Porter’s Gull Island, however, is truer to life than to aspirational, preachy fiction. It’s the story of a profoundly dysfunctional family and thirty-something Jude Bogdan’s stumbling, alcohol-drenched quest to make sense…