The Light Between the Oceans by M.L. Stedman
A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses and used as an aid to navigation for maritime pilots at sea or on inland waterways.
Lighthouses mark dangerous coastlines, hazardous shoals, reefs, safe entries to harbors, and can also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and replacement by modern electronic navigational systems.
Aiding Navigation: Isabel gave Tom something solid to hold on to after his experience in the war. She helped him navigate the world as it was after the horrors he lived through. Tom gave Isabel a future to get away from a town without young men to court her.
Dangerous Coastlines: As in every relationship there are dangers, hills and valleys, Isabel and Tom certainly had obstacles to overcome just living in solitary. Many times I think that living a hermit life would be wonderful and then I know I would greatly miss the companionship of others. Can you relate to the desperation of wanting a child so much that in the same situation you would 'adopt' Lucy-Grace?
'He's lived the life he's lived. He's loved the woman he's loved. No one ever has or ever will travel quite the same path on this earth and that's all right by him'
'He knows that the man who makes the journey has been shaped by every day and every person along the way. Scars are just another kind of memory.'