Throne of Fire- Rick Riordan Response

I am reading Throne of Fire by Rick Riordan. This book is the sequel to The Red Pyramid,  this series is about two Siblings, Sadie and Carter Kane. They have Egyptian ancestry in their blood and they're descended from the gods. They have magical powers and are constantly having to save the world. In this book they are on a quest to find the Egyptian Sun god Ra. They have to find him and free him from the Duat because Apophis (The God of Chaos) is very close to breaking out of his prison, and when the equinox passes the bonds will weaken enough (the equinox is a magical day) that he can break free completely. If Apophis breaks out of his prison he will eat the sun forever casting the world into darkness and then all Chaos will break loose and the world will end as we know it. So it is up to Sadie and Carter to reach deep into the Duat and awaken Ra from his eternal sleep. The way they have to do this is by finding three separate scrolls that when put together form the Book of Ra, this book explains how to awaken him. The Antagonist that stands between them and their goal are may things. Vladmir Menshikov otherwise known as Vlad the Inhaler.  Vladmir is trying to get Apophis out of his prison as soon as possible. Another big obstacle in the story is all of the gods and titans that are opposed to  Carter and Sadie's idea of freeing Ra from  his sleep in the Duat. What's happening currently right now is that Carter and Sadie found the first scroll and know where the second one is. The second one is in Vladmir's desk drawer in Russia. They got the scroll and as they were sneaking out he saw them and they are dueling each other in a heated magic match. What will happen next?