In modern-day England, brothers Nick and Alan try to live a normal life. They get jobs, Nick goes to school (at Alan's insistence), Alan has crushes on girls (and girls have crushes on Nick).Of course, Nick starts right off rescuing his favorite sword from under the sink (and don't think he won't use it), Alan could shoot you before you realized that sweet, smiling guy even knew what a gun was, they've got to watch out for mad Mum in the attic, and they're forced to pack up and move every time a magician or demon bursts into their house. Which is once every couple of months. At best.Enter Jamie and Mae, a brother-sister duo who witness the latest demonic intrusion and need Nick and Alan's help: Jamie's been marked by a demon, a mark that lets a demon trace, hurt, and eventually possess him, leaving nothing of him behind. Alan wants to help them; Nick wants them out of his house. Naturally, brotherly arguments ensue.Between running from, beating up, capturing, killing, and attempting to outmaneuver scheming magicians, of course.The Demon's Lexicon is written by debut author Sarah Rees Brennan. It's the first in a trilogy. The second, The Demon's Covenant, was released in May 2010, and the third, The Demon's Surrender, was released in June 2011.
Incest Is Relative: In a deleted scene revealed during the TDS launch chat, Anzu kisses Nick while in his brother Alan's body. It's noteworthy that demons don't care for taboos like incest and probably can't differentiate between sexual and platonic feelings.
Karma Houdini - Helen avoids any repercussions for killing Annabel by switching sides at an opportune time. Rather disturbingly, it seems like we're supposed to support this.
Kiss of Death - Olivia snuggles up to Black Arthur for a kiss, then sets herself on fire while still holding on to him. Subverted that this doesn't kill him straight off - his son does that a few minutes later.
Knife Nut - Nick. Another character points out that he carries the equivalent of a restaurant's cutlery drawer on him at all times. Sin embodies this trope, as well.
Loners Are Freaks - Nick does try to fit in with the kids at school...sort of. It doesn't really take.
Add in Black Arthur's attacks and Daniel Ryves, in baby Nick's bedroom, with an enchanted knife...this positively abounds.
Parental Abandonment - Nick and Alan's parents aren't exactly around. Their dad's dead and their mum's mad, to start with. Well, Alan's dad and Nick's mum, respectively. Alan's mum is also dead and Nick's dad is the Big Bad.
On a much more normal level, Mae and Jamie's parents didn't pay them much attention even when they were still together. Their dad dislikes Jamie for being gay and avoids Mae for being odd. Their mum, whom they live with, although she loves them, doesn't have much time for them.
Perky Goth - Mae has pink hair, wears corsets and bat jewelery, and almost always has a smile on her face.