"Speaks the Nightbird" is a historical fiction novel by Robert McCammon, set in the late 17th century in the American colonies. The story follows Matthew Corbett, a young clerk who is sent to a small town to investigate a witch trial. The narrative explores themes of superstition, justice, and the struggle between reason and fear. As Matthew delves deeper into the case, he encounters Rachel Howthorne, a woman accused of witchcraft. The novel combines elements of mystery and adventure, highlighting the societal tensions of the time while examining the nature of truth and belief in a world filled with darkness.