One challenge could be the state of the body. If it has been damaged or decomposed, it would be difficult to identify. Another might be the lack of proper identification tools or information at the scene. Maybe there are no fingerprints available or dental records are missing.
Castle might become obsessed with finding the truth about what happened. His writer's mind would start formulating theories and he would stop at nothing to get justice for Beckett, which could put him in dangerous situations.
He would likely feel extreme shock. Just the sight of her body could send his mind into a tailspin. He might also be in denial at first, not wanting to believe that it's really her.
It might start with Castle getting the news of Beckett being in a dangerous situation, like a crime scene or an accident. Then he rushes to the location where her body is supposed to be.
He could become more withdrawn. Losing Beckett like that would make him hesitant to let people in again. He'd be more guarded, fearing another loss.
Castle could initially deny it's her. He'd look for any sign that it's not Beckett, checking for details that are off. As he realizes it is her, he'd break down, crying uncontrollably. His world would shatter because she was such an important part of his life, and he'd be filled with regret for any unsaid words or things they didn't do together.
Another challenge could be external distractions. In the wizarding school, there are always various events and activities going on. For instance, a Quidditch match might be coming up, and Seamus and Dean's minds could be more focused on that rather than on Hermione's teachings.
One challenge would be the lack of medical facilities. With the war raging, normal medical services might be disrupted. There may not be enough healers or proper equipment for her regular check - ups.
Since it's a fanfic, it could go in many different directions. It could be a tragic story where Castle succumbs to cancer, or it could be an inspiring one where he overcomes it. It might also be a story that focuses more on the emotional and psychological aspects of having cancer, such as the fear, the anger, and the acceptance. It could also be set in a particular fictional universe that the original Castle concept belongs to, and the cancer plot could be intertwined with the existing storylines and characters from that universe.
Well, family expectations can be a big issue. Maybe her own family has certain ideas about travel and her in - laws have different ones. Also, in some places, there could be discrimination. An interracial wife might find that some people are less friendly or helpful because of her interracial relationship. Additionally, dietary differences can be a problem. If she has specific dietary needs or preferences from her own culture and the place they are traveling to doesn't easily accommodate that, it can be a struggle.
Well, usually when Castle leaves Beckette in such fanfics, it causes a lot of emotional turmoil for both. There could be moments of self-reflection for Beckette, and maybe Castle realizes his mistake and tries to come back. It all depends on the author's imagination!