Alright. Here it goes. 

Prologue should be spelled like this. I think that the prologue is giving away too much information. It can be used for a huge amount of foreshadowing (kinda like what I did mine:). As you mention Mark at the end of the prologue, we don't know who that is. So in the beginning, you could write: 'My ring on my finger, which had belonged to ____, I laid…' Yeah. I think you could put 'which had belong to my husband or boyfriend or whoever Mark is. The reader can infer that detail with the name Mark at the end of the prologue, that way we know who Mark is. (Sorry… I'm being a bit picky!) 

I'm not so familiar with all those Egyptian terms and names, but I trust you're an expert. 

Ahh. Okay. Sorry. In the beginning of chapter one you explained who Mark is. This is what I get for commenting as I read. 

Okay. Don't refer to the reader, unless you're writing a journal. A few grammar issues here and there. 

The chapters are too short, as said before. I mean, if you're pulling off a thriller like James Patterson, go ahead, but I view this as a novel with historical reference - kind of like Dan Brown writing. So I think the chapters should be longer and more detailed. 

Your sentence structure is a bit simple, and you could use more variety, like combining them with conjunctions. Another thing. 'I pulled my mask off and turned to Mark who had just gotten on deck…' That sentence. It shouldn't be a comma there; it should be a period. It's a sentence describing what the main character was doing and it's not a phrase. 'He pulled his mask off. "I was only playing with you. Besides, I found something."' That's another one. 

I was just skimming this, mostly picking out grammar mistakes. Your chapters can easily be combined into a single chapter. You could resort to putting scene breaks instead of whole chapter breaks (which is what I'm going to do with my novel:). 

For the whole part, I liked this novel. It isn't about the same old things we hear everyday: boys, parties, or flying unicorns. Historical significance is present in your novel, and I really like it. Mark seems like a really realistic person to me. This novel has a lot of potential, and if you keep submitting, I'll read it all gratefully. Keep writing! :D