Son should have been the first sequel to the Giver. It actually starts in the same community as the Giver, this time with Gabriel’s birthmother Claire. We follow her life: first in the community, then in a small seaside village, and finally in the same village where Jonas and Gabriel ended up.
It’s a really interesting story and I particularly like how each of the sections builds on what came before, while letting us watch Claire grow and change. The links to Gathering Blue and Messenger are there as well, although I personally wish they’d been ordered a little differently.