If you haven't yet heard, not only is there a series following the The Giver (and possibly someday a movie?), which comes as a shock to many people, but the fourth and final book in the series has been released. Each of the first three books followed a different character in different communities of the same world; the final installment revisits the original world of The Giver, and brings the characters together.
In Son, by Lois Lowry, we meet Claire, who has been given the dubious honor of being a Birthmother. Everything is going along well, until she has problems during the birth, and is released from her duties as Birthmother. Although she knows she is not supposed to wonder about the boy she has given birth to, she can't stop thinking about him and hoping he is well. Her story continues as she struggles to find her son and ensure his well-being.
Son is a great conclusion to the Giver series, although, as someone who has loved all of the books in the series, the ending was a little anti-climactic for me, and some of the themes were more heavy-handed than is usual for Lowry. However, the book overall is an excellent read, and one I would recommend for any lovers of The Giver.