What is the red pyramid Chapter 1 summary?

Carter talks about his travels with his father Julius. They go to England to get Sadie. Julius talks to a mysterious man. They head towards the museum and stops and sees two people stand then disappearing. So they hurry and get in a cab. They arrive at the museum and Julius tells the driver to keep driving. Then 5 seconds later, a boy, a girl, and a father get in quickly. 8D