The Throne of Fire by Rick Riordan

The Throne of Fire is a 2011 fantasy adventure novel based on Egyptian mythology written by Rick Riordan. The Throne of Fire is the second novel in The Kane Chronicles series, which tells of the adventures of modern day fourteen-year-old Carter Kane and his thirteen-year-old sister Sadie Kane, as they discover that they are descended from the ancient Egyptian pharaohs Narmer and Ramesses the Great.
The Throne of Fire was released on May 3rd, 2011. The book The Throne of Fire takes place roughly 3 months after the first one.
Ever since the gods of Ancient Egypt were unleashed in the modern world, Carter Kane and his sister Sadie have been in trouble. As descendants of the House of Life, the Kanes have some powers at their command. But the devious gods haven't given them much time to master their skills at Brooklyn House, which has become a training ground for young magicians. And now their most threatening enemy yet—the chaos snake Apophis—is rising. If they don't prevent him from breaking free in a few days' time, the world will come to an end. The story begins with Carter and Sadie breaking in to the Brooklyn Museum during a wedding to search for the Book of Ra, which will allow them to speak with Ra to help them imprison/kill Apophis the lord of chaos. Along with them are Khufu the baboon, and their new trainees, Jaz and Walt. Instead, they find a papyrus scroll that is booby trapped with a series of fire traps. As Carter and Walt distract the demons that are apart of the booby trap, Jaz perform a spell that banishes the demons back... (Summary by Wikipedia)