Derek and Emily, FBI agents, have happily been dating for a year now. Will, a local police officer and JJ, also an FBI agent on the same team as Derek and Emily, are happily married with a son, Henry. But when Will discovers a series of mysterious letters, he questions JJ about her secrecy and she has doubts about his trust issues. Meanwhile Emily has a secret that she's been holding back, she needs to tell Derek and doesn't know how he will react, but will a fatal accident change everything? As pages turn and the tale unfolds, secrets and lies are revealed and relationships are tested. Will they be able to overcome the challenges or will they break away leaving each other forever?