By any account, the impenetrable barrier of sea ice that blocked the Brendan's Isle halfway up the Labrador Coast should not have been there in late July, in what was one of the hottest summers in memory a few hundred miles to the south. Frustrated and mystified at having to turn back so early in his 1991 northbound voyage, sailor Myron Arms became determined to explain the anomaly. Three years later, having pursued this obsession from...