Every keeper remembers the last night of the lamp. For Edda Marrow it was a Tuesday in February, and she will tell you about it eventually, in order, the way she would have written it up. But not first. First she wants you to understand the weather.

On the second Thursday of every month, a dozen or so retired lighthouse keepers climb the stairs of Port Ellery Town Hall to the Corn Room, a long, drafty room above the harbor where grain was once auctioned by the sack. They bring flasks, ginger cake and reading glasses on cords. Mira Toft, the project archivist, has been there since eight, laying out what she calls the furniture of the job: two folding tables, a flatbed scanner, a laptop, a dehumidifier that hums like a generator two rooms away, a box of cotton gloves, and the morning’s journals in gray archival boxes, each labeled with a station and a span of years. At the far end, two clothes rails hung with moving blankets make a booth for recording. Through the long windows, on a clear day, you can see Skerrow: a low gray island nine miles to the southwest with a white tower on it, small enough to cover with your thumb.

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