I did go back and reread the chapters and did misread/misunderstand some things and thank you for that: (1) In Ch 1, Aideen said she was the "Emperor's personal assassin" not the "Empire's best assassin"; (2) she did know that Jenna went out, but wondered how far she went so I was wrong for that part (but I never said she was outside on a date). But like you said in your comment, Diceon's a prince, NOT an assassin. Yes, he may have great skills from experience, but he wasn't specially trained to be an assassin from a young age like Aideen was. And actually, in Ch 15, Aideen was able to feel Jeldion's shadow eyes on them in her bedroom so she should be able to feel the prince's presence, so why couldn't she feel the prince's presence in this chapter? She also couldn't feel the presence of the 'bad guys' when they rescued the kid in Ch 22, but Diceon could?
To be honest, Aideen has been lacking in her "assassin" skills, let alone 'best assassin' skills. So far, Aideen hasn't really been able to feel people's presence (a common assassin/spy skill), but Jenna can, like when she felt the Jeldion's shadow eyes on them in their bedroom and warned Aideen about it in Ch 7. There's some other examples of Jenna warning Aideen of other people's presence before Aideen could feel them, but again that's weird cuz Aideen, as the Owl's leader, should have that ability as an assassin and as a leader of assassins.
Aideen has also admitted, herself, to making quite a few mistakes and has made a mistake in almost every chapter...but an assassin making that many mistakes wouldn't be a good assassin and would've probably already gotten discovered/caught...and she was...by Diceon in Ch 9/10. Some of her mistakes/contradictions examples:
(1) in Ch 9, she got needlessly distracted in the middle of the fight and got a visible hand scar which led Diceon to figure out her identity cuz she made another mistake in the bedroom; or
(2) in Ch 13 when she was blatantly staring at Diceon and was surprised when she got caught lol;
(3) starting in Ch 18, she portrays all her emotions on her face, especially to Diceon, and doesn't show the same restraint she's been keeping up AND should've been still upholding since she's an assassin and doesn't or shouldn’t fully trust him.
The point is, I've read other stories with undercover spies/assassins and haven't seen as many holes as I've seen here. So, yes, I do understand the plot, I was just pointing out the holes which was funny to me. I do enjoy the story, I just would've prefered the author to have paid more attention to details like that and be less contradicting. But there was no need for your aggression, I'm more than happy to have respectful conversations when our thoughts differ.