Ho hum. Charming enough writing to compensate for a loathed trope ("Oh! I have a dreadful trauma in my past that led me to making this firm vow that keeps us from being together! Nothing else hinders us any more, so I will cling to this vow like nobody's business! ...okay now I'm done with that vow! Trauma overcome! Let's get hitched and make babies!"). I do appreciate the mystery thrown in, though, even if it was easily solved. I do enjoy romances that have a little external something-something in addition to the conflict between hero and heroine. Especially when that conflict is based around a stupid vow that is ultimately easily overcome, rather than the heroine's far more understandable (for me) desire for independence, which also gets tossed by the wayside.
...actually, the more I think about it, the more I'm kind of pissed the heroine's never gonna see Egypt now.