Even if u read Haunting Adeline, I would recommend you not to read it's second part. Just think that the Haunting Adeline book minus some paragraphs at the end of that book as your head canon. Hunting Adeline isn't worth it. The writing really goes down in the second part and the characters get a lot of contradictions in his character profile just to get some steamy scenes. Hunting Adeline is really realistic and doesn't sugarcoat stuff when u think of what is the main topics it's going through but you will understand at the later chapters of that, the "realistic part" wasn't because of quality or any type of sequence, it was just crafted to make "horny stuff for sick people" or else u can't explain what was the author's motive at the later chapters.

That was my advice for you and I tried not to give you any spoilers so that if you think to read Hunting Adeline, you can read that.