Weird coincidences.
Two of the books I read this weekend made mention of cars with gullwing doors*.
Ramon snorted. "Classic. Check out the gullwing doors." (p6)
And 7 Souls (In this one, I don't think that the doors are actually gullwing doors, they're just described as looking like gull wings. Which is an odd choice, but whatevs.):
She got one final glance of Trick's empty Mercedes, its long low doors spread wide open like gull wings, its sapphire headlights illuminating the emerald leaves, its windshield wipers flicking back and forth, back and forth. (p144)
Also, both 7 Souls and Secret Society had lots of Ancient Egyptian imagery.
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*Which, according to Wikipedia, is Flügeltüren in German. That's so rad that I don't know why anyone would choose to use the English.