On the night of June 4th, a woman gives birth in a Beijing hospital alone. Thus begins the unraveling of Su Lan, a brilliant physicist who until this moment has successfully erased her past, fighting what she calls the mind’s arrow of time. When Su Lan dies unexpectedly 17 years later, it is her daughter Liya who inherits the silences and contradictions of her life. Liya, who grew up in America, takes her mother’s ashes to China. In a territory inhabited by the ghosts of the living and the dead, Liya’s memories are joined by those of two others: Zhu Wen, the woman last to know Su Lan before she left China, and Yongzong, the father Liya has never known.