Death on the Nile is an Agatha Christie classic.
I much more prefere the Miss Marpel novels, however. Hercule Poirot is intendet to come across as arrogant, but in some cases it's simply annoying. 
Contrary to other Agatha Christie books I almost immediatly knew, who the murderer was.

although, I so very much hoped that Jackie would somehow be innocent

I liked that all charaters had their faults and you really could not agree with any of them. As a reader you never really knew who's side to be on.
Also this story had to many characters and some of them didn't feel necessary to the plot at all.
Worst of all is the constant racism expressed by some of the characters, which really ruins some chapters and the reading experience. Hopefully newer editions edit it out, as it is in no way important the the storyline and only ruins the book.
I was looking forward to seeing the new movie, until I saw that Armie Hammer was going to be in it, so now I'll watch the older film version, which also looks amazing.

World renowned detective Hercule Poirot travels to the Nile on vacation but he won't find much rest on the pleasure cuise when a wealthy young socialite is murdered and everyone has a motive, some more compelling than others.