Red Pyramid

Red Pyramid is a book by Rick Riordan. It is about two kids, Carter and Sadie Kane. There mom died for a Greek God named Bast. Bast is the god of cats. There dad Julius Kanegot stuffed in a coffin by Set the god of evil. Sadie and Carter try to stop Set and get there dad out of the coffin.

http://www.rickriordan.com/my-books/kane-chronicles/books/red-pyramid.aspx