Message in a bottle - Nicholas Sparks

My Darling Catherine,

Where are you? And why, I wonder as I sit alone in a darkened house, have we been forced apart?

When journalist Theresa Osborne finds this desperate message washed up on a Cape Cod beach, it raises questions that intrigue her. Who is the author, a man called Garrett—and who is Catherine? And what is it that has torn them apart?

Theresa, wary of romance since her husband shattered her trust, finds herself unaccountably drawn to these people and their secrets, and embarks on a search that brings her to an unexpected confrontation...