Lively is sixteen the first time she watches her great-grandfather die. His final request was for his ashes to be scattered in Pearl Harbor, where he left his friends over eighty years ago. It's an easy wish to grant. That is, until Lively accidentally time travels to 1941 after chasing the ghost of a pilot through a museum. She falls in love with him, but learns she's not the only one with a mysterious past-Caleb has secrets of his own and time travel might be the only way for them both to survive. Lively has no idea how to get back to the present and times ticks closer to December 7th-the day that Caleb dies.