Tom (portrayed by Mike Fassbender) has just returned from fighting in WWI. Suffering from PTSD (what they called shell shock back then), he wants a nice, quiet occupation, preferably in solitude. He gets his wish as he is offered the post as a lighthouse keeper on a remote island. It suits him perfectly as nobody else is on the island to haggle with him.
Tom has the most unbelievable luck with women of any man who ever lived. While he planned to be a hermit, he falls in love with a young lass from the mainland named Isabel (Alicia Vikander). She gladly moves to the island with him & the two are very happy together as a couple. He is a protective husband & she is a loving wife.
The one thing missing is their ambitions to start a family. After suffering 2 miscarriages, Isabel is depressed. In a twist of fate, their yearning to have a child seems to be fulfilled. However, it might not be altogether ethical.
Such is the backdrop of the current film. While most love stories are about couples, this one is different in its focus on a married couple's desire to have children. For Alicia Vikander, this role demonstrates her acting range as the demure Isabel is on the opposite end of the spectrum from the martial arts wielding character of Lara Croft whom she portrayed in TOMB RAIDER.
While this is most assuredly what would be called a "chick flick" I believe it would appeal especially to people who have tried to have a child of their own. In a way, the lighthouse itself becomes a way of "lighting the path forward" to them to parenthood. For Alicia fans, as always, this movie is a must see!