Grace meets Isabel at Beck's house. While Isabel and Jack talk, Grace talks to Beck.
Beck explains why he changed Sam: “I saw him with his silly, vapid parents, them just as clueless as a pair of pigeons, and I thought, I could be better for him. I could teach him more” (58.30). Could that be the same reason they tried to change Grace?
After a long conversation, Beck agrees to put out some drugged meat to lure in Sam so that they can try to cure him.