I'm writing a novel where a person who has decided to commit suicide can hire some murderers to kill he/him in the way he/she prefers. There are only two members running this service. A man and a woman.
The first chapters (20,000 words) are told from the eyes of a girl who wants to die in the arms of the boy she loves. Once her wish is fulfilled her POV ends.
The middle chapters (20,000 words) are seen from the eyes of the man I mentioned before (when he was young). Turns out he also had a death wish: to die saving someone. Once his wish is fulfilled his POV ends.
The last chapters (20,000 words) are seen from the eyes of the woman I mentioned before (turns out she also wanted to die in the past). The novel ends with her.
My concern is this: the reader will invest emotionally in the character of the first chapters, only to see her disappear in the middle of the novel.
Will this be an issue? If so, what can I do to fix it?
Note: the man and the woman running the service appear throughout the novel (the middle and end of the novel focus on their backstory).
Note 2: some characters don't die.