Lucie once again sees the 'changeling boy' who reveals himself to be the ghost of Jesse Blackthorn, the late son of Tatiana. It is revealed that James met Grace in 1899, when Tatiana hired him to cut briars for her, and that James has been in love with Grace since he was 13 years old. Luckily Matthew intervenes, saving Cordelia's reputation.

James leaves Cordelia stranded on the dance floor when he goes to greet the mysterious new arrival, Grace Blackthorn, the adopted ward of Tatiana Blackthorn. As they are dancing, James gives some details about the guests at her request. When a waltz starts to play, James requests Cordelia to dance with him. Lucie introduces Cordelia to some of her acquaintances. The Herondales hold a ball at the Institute to welcome the Carstairs family in London Cordelia and her family are introduced to the rest of the guests by Tessa. Lucie tells Cordelia that James is in love, leading Cordelia to believe that her feelings for James might be requited. The Carstairs are greeted by Tessa, James (who Cordelia has a crush on), and Lucie (Cordelia's soon-to-be parabatai). Her father, Elias, has been arrested for supposedly mishandling a vampire raid, and the Carstairs wish to make powerful allies in London to save their reputation. Meanwhile, Cordelia Carstairs enters the London society along with her brother (Alastair) and mother (Sona). This strikes them as odd due to the fact that demonic activities have been scarce in London for some time. The demon recognizes James, who goes into the shadow realm (a unique power as a result of his warlock heritage) for the first time in 3 years. Six years later, in 1903, James Herondale and his friends, his parabatai Matthew Fairchild (son of Charlotte Fairchild and Henry Branwell), Thomas Lightwood (son of Gideon Lightwood and Sophia 'Sophie' Collins), and Christopher Lightwood (son of Gabriel Lightwood and Cecily Herondale), find a Deumas demon while patrolling. She gets lost but finds her way back with the help of a mysterious young boy, who she initially believes is a faerie changeling. In 1897, in Idris, ten-year-old Lucie Herondale, daughter of Shadowhunter William 'Will' Herondale, and half warlock/half Shadowhunter Theresa 'Tessa' Gray, sneaks into Brocelind Forest. However, several flashbacks (known as 'Days Past') are scattered between the official chapters.

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Chain of gold series