The first book is about when Carter and Sadie's mother died they have no idea who each other are. Sadie lives with her grandparent in London and Carter lives with his father in Egypt. Until the meet up in the the british museum. Where they unleash a crazy god named set and go on crazy adventures.
The second book is about 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. In other words, it's a typical week for the Kane family.
To have any chance of battling the Forces of Chaos, the Kanes must revive the sun god Ra. Spoiler alert the do revive the sun god but not the way the expected.
In the third book well I have already explained some of it. Can't wait to tell you guys the rest of the book.