The Separation is the thirty-second book in the Animorphs series, written by K.A. Applegate. It is narrated by the two 'halves' of Rachel.
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Rachel, one of the Earth teenagers dedicated to stopping the parasitic alien race known as the Yeerks, is horrified when she finds herself split into two nearly identical girls.
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From Wikipedia
The Separation is the thirty-second book in the Animorphs series, written by K.A. Applegate. It is narrated by the two 'halves' of Rachel.
In the article:
Product Description
Rachel, one of the Earth teenagers dedicated to stopping the parasitic alien race known as the Yeerks, is horrified when she finds herself split into two nearly identical girls.