The Kiss Quotient series has been one of my favourite romance series to date. I absolutely love the autistic rep that Helen Hoang gives us, and The Heart Principle is no exception. Autistic and neurodivergent characters don't usually get to be romantic leads. I adored Anna's character, her perpetual people-pleasing, her creative block. Quan is a great romantic lead, and I really enjoyed his storyline too; I almost wish it had been given a bit more weight. Overall, I devoured this one in two sittings, and it was just the ending that let it down. I'm not sure why the last 10% covers several years and speeds through it in such an odd series of vignettes. The rest of the book was very well-paced, and it seemed like the ending was just tacked on. It might have worked better as a single epilogue.

I would read absolutely anything Helen Hoang writes, and if she decided to make this a longer series, I would probably perish from glee.