It gets worse. There's a discussion about this on musesfool's journal, and tarie posted this plot synopsis from Cassie Claire's website:
When fifteen-year-old Clary Fray heads out to a New York nightclub with her best friend Simon, she isn't expecting to witness a murder, much less one committed by three teenagers covered with odd markings and sporting bizarre weapons. And she's more than a little startled when the body disappears into thin air. Soon Clary is introduced to the word of the Darkhunters, a secret cadre of warriors dedicated to ridding our world of demons. And she's introduced with a vengeance, when her mother disappears and Clary herself is almost killed by a grotesque demon. How could a mere human surve that attack and kill a demon? The Darkhunters would like to know...
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When fifteen-year-old Clary Fray heads out to a New York nightclub with her best friend Simon, she isn't expecting to witness a murder, much less one committed by three teenagers covered with odd markings and sporting bizarre weapons. And she's more than a little startled when the body disappears into thin air. Soon Clary is introduced to the word of the Darkhunters, a secret cadre of warriors dedicated to ridding our world of demons. And she's introduced with a vengeance, when her mother disappears and Clary herself is almost killed by a grotesque demon. How could a mere human surve that attack and kill a demon? The Darkhunters would like to know...
Really, could she be any more blatant?