The Secret Life of CeeCee Wilkes by Diane Chamberlain

In 1977, pregnant Genevieve Russell disappeared. Twenty years later, her remains are discovered and Timothy Gleason is charged with murder. But there is no sign of the unborn child. CeeCee Wilkes knows how Genevieve Russell died, because she was there. And she also knows what happened to the missing infant, because two decades ago she made the devastating choice to raise the baby as her own. Now Timothy Gleason is facing the death penalty, and she has another choice to make. Tell the truth, and destroy her family. Or let an innocent man die in order to protect a lifetime of lies...