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Book cover of The Heart Principle
The Heart PrincipleHelen HoangThe Kiss Quotient, book 3

Characters in The Heart Principle

2 characters, main characters first.

Main characters

  • Anna Sun

    A classically trained violinist navigating burnout, family caretaking, and a possible autism diagnosis.

  • Quan Diep

    A tattooed, motorcycle-riding man who becomes Anna's partner; brother of a character from an earlier book in the series.