Louis Tomlinson has a story, one that he doesn't like to tell. A story of a navy girl back home who he begged not to go. Cassidy Davis has been in the Royal Navy for five years working as a pilot. She's good at her job, in fact, she's one of the best. The only thing that means more to her than her job is her family and Louis Tomlinson. But what happens when it all goes wrong? Can Louis find out the truth behind three words? Or is Cassidy doomed to be Missing in Action? One promise will change them forever. •••••••••••••