作者：Rebecca stead，美国畅销儿童文学作家。第一部作品《第一光》，《当你当达我》是该作者的第二部作品，这部作品让她一举成名。她生于纽约，目前和她的丈夫和两个儿子还住在那里。

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一个绝对扣人心弦的故事……我不能放下它，直到我读完它。

——《摩法书》的作家Tamora Piere

一个非常刺激的集科幻、神秘和探索为一体的小说。

——学校图书馆周刊

可信的，吸引人的，少年读者们会发现这将是一个值得进行的旅程。

——出版者周刊

Winner of the 2010 John Newbery Medal

Four mysterious letters change Miranda’s world forever.

By sixth grade, Miranda and her best friend, Sal, know how to navigate their New York City neighborhood. They know where it’s safe to go, like the local grocery store, and they know whom to avoid, like the crazy guy on the corner.

But things start to unravel. Sal gets punched by a new kid for what seems like no reason, and he shuts Miranda out of his life. The apartment key that Miranda’s mom keeps hidden for emergencies is stolen. And then Miranda finds a mysterious note scrawled on a tiny slip of paper:

I am coming to save your friend’s life, and my own.

I must ask two favors. First, you must write me a letter.

The notes keep coming, and Miranda slowly realizes that whoever is leaving them knows all about her, including things that have not even happened yet. Each message brings her closer to believing that only she can prevent a tragic death. Until the final note makes her think she’s too late.