Updated: Mon, 26 Aug 2013 08:00:00 GMT | By Cat Watson, Contributor, MSN Entertainment
The Mortal Instruments: City of Bones - what you should know

Isabelle (Jemima West)

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Isabelle Lightwood (Jemima West) is the feisty Shadowhunter who, like her brother Alec, takes her job rather seriously.

Will her personal attachment to the cause mean she ends up in too deep? And what happens when Simon ends up falling for her?