Lily, a museum curator, discovers a painting that looks just like her and is sent to find where the painting came from and who painted it. She tracks the painting down to the post office it was sent from in Ireland. There she meets William and Saoirse, a brother-sister duo who run the post, and who offer her help and friendship on her quest. But William knows more than he's letting on. Will he reveal what he knows if it risks his growing relationship--and mutual love--with Lily?