The Last Hours is an upcoming trilogy written by Cassandra Clare and is the sequel series to The Infernal Devices. It is the fourth series to be published in The Shadowhunter Chronicles, but is the second chronologically. Its export rights were acquired by Walker Books, and the first book, currently set to be Chain of Gold, is slated for a 2016/2017 release.

The Shadowhunters enter the Downton Abbey era in The Last Hours. Will Herondale is head of the London Institute, where he lives with his wife Tessa. But now it's their children, James and Lucie, who take center stage, alongside their parabatai, Matthew Fairchild and Cordelia Carstairs. Begin their adventures in Chain of Gold.

Set in Edwardian London and fin de siècle Paris 1903, right around the time the Victorian era tips over into the Edwardian era, The Last Hours will deal with Will and Tessa's children (James and Lucie), Jem Carstairs' cousins (Alastair and Cordelia), Charlotte and Henry's children (Charles and Matthew), Tatiana Blackthorn's children (Jesse and Grace), Cecily and Gabriel's (Anna, Christopher, and Alexander), and Gideon and Sophie's children (Thomas, as well as Barbara and Eugenia, though their presence in the series is still uncertain), and many more.

The story will be told in James and Lucie's point of views, among others. The main characters, at 16-17 years old, will be James, Lucie, Christopher, Grace, Cordelia, Alastair, Matthew, Charles, and Jesse, the children of characters from The Infernal Devices. Most of the characters from The Infernal Devices, now aged and older, will make appearances.

The Last Hours will deal quite a bit with Clave politics, as well as their attitude and view about certain issues such as homosexuality, and moves back and forth between London, Paris, Cornwall, and Idris. Iron Sisters are also expected to become important in the series.

The following are the working titles of the books in series, arranged according to the latest update/revealed order, which may or may not change:

Chain of Gold
Chain of Iron
Chain of Thorns

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