Jarlath "Jar" Costello's girlfriend, Rosa, committed suicide when they were both students, and Jar has thought about her every day since. It's been five years, yet Jar is still obsessed with the idea that Rosa, the one true love of his life, is alive. When Jar receives a message from Rosa's aunt telling him that she's found Rosa's diary, he embarks on a frantic quest to finally make sense of the highly suspicious circumstances surrounding her death.