Conspiracies, or so it's hinted.
The second book in the Shadow Children series is Among the Imposters.
The second in the series is Among the Impostors.
The first book in the Shadow Children series is Among the Hidden.
There are currently no plans to publish a third book in the Shadow of the Dragon series.
Yes, there is a 4th book to C.C. Hunter's Shadow Falls series. It is called Whispers at Moonrise.
The third book of the Dormia series is called: The Shadow Tree.
The Shadow in the North was written by Philip Pullman. It is the second book in the Sally Lockhart series.
The book that follows "The Throne of Fire" in the Kane Chronicles series is "The Serpent's Shadow."
The next book in the series is called The Shadow Rising.
The second book in the series is Things Hoped For.
The first book is called "Lone Wolf" the second book is called "Shadow Wolf", the third book is called "Watch Wolf", the fourth book is called "frost wolf".
If what your asking is "Is there any sequels to the book The Red Pyramid" (by Rick Riordan) than the answer is yes, in the series the first book is 'The Red Pyramid' the second book is 'The Throne Of Fire' and Riordan is coming out with a third book to the series named 'The Serpents Shadow.' Hope this was helpful..:)