Sam is feeling lost while Grace is at school. What's a wolf boy to do?
He decides to have a flashback: when he was younger, Beck home-schooled him.
Shelby, on the other hand, wasn't too much into education. She wanted to teach Sam how to be a wolf, and do wolfy things.
Beck eventually had to step in and tell Shelby, “Sam will always be Sam. […] Don't you ever tell him differently, Shelby. Or I will take you back where you came from” (29.32). Yeah, back to the cesspool she crawled out of.
When the flashback ends, Sam decides to check Beck's P.O. Box. Wolves can't open P.O. Boxes, and someone has to check the mail.
Sam only finds a couple letters and some junk mail. He realizes this means that “Someone had been here. Recently […]” (29.49).