I have not read the novel. I read your entire summary and am less certain of what it is about than before. Your writing style appears to be describing individual events, one after another, and has no cohesion to it. I am fairly certain this is a somewhat controversial book. Yet your summary does not describe in the slightest any of the reasons why it would be controversial.
The only thing I learned about the novel from your summary was this: Someone was killed, who may or may not have known something about the grail, and the victim's daughter goes searching for clues about the murder, becoming entrenched in her father's work to find the grail in the process.
Now that's one (run-on) sentence that describes just about everything I learned from your summary.
Stylistically I don't like the summary, but I don't know what structure you were going for. Traditionally I would expect a one liner to grab my interest, followed by a brief outline of the general theme of the novel. Then I would expect some sort of summary of the summary, perhaps key plot elements, which would then be expanded in individual paragraphs.
Instead you appear to just have arbitrarily broken your summary into paragraphs, or if not arbitrarily then only at "plot points".
The only thing I learned about the novel from your summary was this: Someone was killed, who may or may not have known something about the grail, and the victim's daughter goes searching for clues about the murder, becoming entrenched in her father's work to find the grail in the process.
Now that's one (run-on) sentence that describes just about everything I learned from your summary.
Stylistically I don't like the summary, but I don't know what structure you were going for. Traditionally I would expect a one liner to grab my interest, followed by a brief outline of the general theme of the novel. Then I would expect some sort of summary of the summary, perhaps key plot elements, which would then be expanded in individual paragraphs.
Instead you appear to just have arbitrarily broken your summary into paragraphs, or if not arbitrarily then only at "plot points".