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Amber Smith opens up to PEOPLE about writing her new book The Girl on the Bathroom Floor

In the book, Amber recounts the tragedy of her 3-year-old son's death after drowning in their pool

The Girl on the Bathroom Floor is available now

When Amber Smith sat down to write her new book, The Girl on the Bathroom Floor , she relived the heartbreak of her past.

In her new book, Amber, 43, recounts the tragedy of her 3-year-old son River Kelly drowning in their pool and the journey to healing that followed. Speaking with PEOPLE ahead of the book's release on Tuesday, Oct. 14, Amber detailed her journey writing the book.

"It was hard. I cried on parts that I wouldn't think that I would cry about. It surprised me as I was writing which chapters I would cry through," Am

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