【我不是我，但同時我就是深愛你的我】

從來都沒有任何線索或提示，A不知道明天他會身處哪裡、變成誰。A每天醒來都會發現自己是另一個人，所以他早就為自己下了一個人生準則：永不介入別人的抉擇、不要被發現也永不留戀。然而，直到他在賈斯汀的身體中醒來，並遇見了賈斯汀的女朋友芮艾儂，他就再也無法死守原則，每天打破底線...

雖然芮艾儂與賈斯汀是男女朋友，卻只是表面情侶，深知芮艾儂心事與煩惱，A每天都用不同的身分，日復一日，盡可能地想更接近芮艾儂，芮艾儂能夠發覺A的存在嗎，而身分不固定的A又要怎麼和芮艾儂談戀愛，所謂"靈魂"伴侶是可行的嗎？

小說中除了有如不可能任務的求愛過程，另一個可看點在於主角A在不同種族、文化、年齡層甚至性別的角色間跳換，雖然他能夠翻看該身體主人的回憶，但仍需小心判斷當下的抉擇是否違反身體主人的意識、是否會破壞其原本的生活，從中可以探討靈魂、意識與身體間的哲學關係。

Every day a different body. Every day a different life. Every day in love with the same girl.

It’s all fine until the morning that A wakes up in the body of Justin and meets Justin’s girlfriend, Rhiannon. From that moment, the rules by which A has been living no longer apply. Because finally A has found someone he wants to be with—day in, day out, day after day.

With his new novel, David Levithan, bestselling co-author of Will Grayson, Will Grayson, and Nick and Norah's Infinite Playlist, has pushed himself to new creative heights. He has written a captivating story that will fascinate readers as they begin to comprehend the complexities of life and love in A’s world, as A and Rhiannon seek to discover if you can truly love someone who is destined to change every day.