Cassandra Clare's Next Series After 'TDA' Will be Called 'THE WICKED POWERS'

We TLH is still a mystery title, but Cassandra Clare gave us hints about one of her next series: TWP. The title comes from the Shadowhunter Rhyme:

[...]Saffron lights the victory march,
Green will mend our broken hearts.
Silver for the demon towers,
And bronze to summon wicked powers.

The Wicked Powers will take place 3 years after the end of The Dark Artifices.

"what year will TWP take place since TDA takes place after 5 years of TMI?" Three years after the end of TDA. @TheBookFanatics

— Cassandra Clare (@cassieclare) June 26, 2013

After some clever Shadowhunters guessed "The Wicked Powers ," Cassandra Clare tweeted:

Y'all are so clever.
— Cassandra Clare (@cassieclare) June 26, 2013

Cassandra Clare Talks About New Possible Shadowhunter Series

Cassandra Clare talks about her future plans to write about more Shadowhunter series.

My plan at the moment is to do five Shadowhunter series, total. I don’t know if I’ll do any series in the Shadowhunter world beyond that. I don’t know why five exactly — maybe because one of my major literary idols has always been Tamora Pierce and she did five series set in Tortall. :) Maybe I think I have five stories to tell in this world. Maybe I’ll get to the end and want to tell more. Maybe not — I have a stockpile of other worlds and stories in my head; I’m writing one of them by writing Magisterium now, but there are many others.

About the Shadowhunter world:

There is a special sort of enjoyment in developing stories in a created world, because you can take the rules you yourself have invented, and bend them or break them. You can create connections and history — the story of Isabelle’s ruby necklace stretches back all the way to Vampires, Scones and Edmund Herondale. Then again, with a brand new world, you get to make everything up again. It’s like: brand-new baby or adorable five-year old? They’re both good.

About new series:

(The five Shadowhunter series are TiD, TLH, TMI, TDA, and very far down the road, TWP. Don’t even ask about that one! It’s too far in the future! There are other Shadowhunter projects like The Bane Chronicles and the graphic novel project about the Circle, currently in planning stages and known as TST, but I’m not counting them: I’m only counting book series/trilogies written solely by me.)