Proluge

" 'Who is she?' Jessamine demands.

'She's my Friend,' Jem says calmly. 'My best friend, actually.'

'I thought Will was your best friend,' Henry says.

'She's right after,' Jem grins at me. I return the grin. "

• Completed •

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DISCLAIMERS
• All characters (except Ella and some other side characters) are owned by Cassandra Clare, the author of The Infernal Devices trilogy
• At least 40% of the book contains paragraphs of the original stories.

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At least read Clockwork Prince before reading Clockwork Angel if you don't want to get spoiled at all. (It's a minor spoiler that would be revealed at the start of Clockwork Prince)
Apart from that, read according to the Chapter headers at the start