If the chapter's name is for example Hateful Hearts Chapter 14. This means that you'll have to read chapter 14 in the book Hateful Hearts before you can read it or else you won't understand it.

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Twisted Hearts #1 & #2 Chapter 16

Read the first book and chapter 16 of the second book.

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If the chapter's name is Hateful Hearts, it means that you can read the chapter before you've read the book or whenever you like.

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If the chapter's name is for example After Hateful Hearts, it means to finish the book before reading that chapter.

Just comment if there are any questions.

FROM TODAYS DATE, HATEFUL HEARTS OR ANY BOOKS BEFORE TWISTED HEARTS IS NOT OUT YET.