After returning from 1869, Tilly Fletcher is determined to keep her time-travelling a secret from her friends and family. She attempts to put the past behind her and move on from the life and the man she left behind, but that proves difficult when she finds letters written in her journal from Nicholas. Tilly is loving the small connection to him, until she reads one disturbing letter, forcing her to desperately seek out more information. During this search, she discovers a shocking Clay family secret, one she believes shouldn't have stayed a secret. Torn between returning to the past or staying in the present, Tilly must decide if Nicholas deserves to know the truth, or accept history has already been written and move on.