Despite being newly married to a man called Grady, Shug instigates a sexual relationship with Celie on her next visit. One night Shug asks Celie about her sister, and Shug helps Celie recover letters from Nettie that Mister has been hiding from her for decades. The letters indicate that Nettie befriended a missionary couple, Samuel and Corrine, the well-dressed woman that Celie saw in the store, whom Nettie eventually accompanied to Africa to do missionary work. Samuel and Corrine have unwittingly adopted both Adam and Olivia. Corrine, noticing that her adopted children resemble Nettie, wonders if Samuel fathered the children with her. Increasingly suspicious, Corrine tries to limit Nettie’s role in her family.