The beginning of the plot in which author give you information necessary to folllow story?

The air hung heavy with the scent of salt and decaying seaweed. A lone lighthouse stood sentinel against the relentless onslaught of the North Sea, its beam cutting through the gathering darkness like a beacon of hope. Inside, the keeper, a weathered man named Finnigan, sat by the fire, a worn leather journal in his lap. He was about to begin writing his final entry, a record of the strange events that had unfolded in recent weeks, events that had shaken him to his core and left him questioning the very nature of reality.