Dawn at Congdons Creek. (Credit: Martin Burke) A former Islander is trying to unravel a mystery he’s been investigating for years: Who owns the creeks and inlets of Shelter Island? Some say it’s a fool’s errand, a pointless quest, but Peter Wright said his research leads him to disagree. Mr. Wright owned property in the 1970s at the corner of North Ferry and Manwaring roads, where the White Oak Nursery is now, across from the IGA. Around that time his father-in-law was part of an investor group considering buying the Mashomack Preserve property from a real esta...