Gil Martins, an agent with the FBI’s Domestic Terrorism Unit in Houston, confronts the violence generated by extremism within our nation’s borders every day. He sees hatred and destruction wrought by every kind of “ism” there is, and the zealots who kill in their names. Until now, he has always been a part of the solution—however imperfect—a part of justice. But when Gil discovers he played a key role in wrongly condemning an innocent man to death row, it shakes his faith—in the system, in himself, and in God—deeply. It even estranges him from his wife and son. Desperate, Gil offers up a prayer. To know God is there, not through a sign or physical demonstration but through the strength to cope with his ever-growing, ever-creeping doubts. His problems become more than personal as things heat up in Houston. A serial killer terrorizing the morally righteous turns out to have religious motivations, upping the case from homicide to domestic terrorism. A number of prominent secular icons die or are grievously injured abruptly and under suspicious circumstances, the latest of which is a New Atheist writer who’s fallen into an inexplicable coma. Left and right, it seems Gil can’t escape the power of God and murder. As Gil investigates both cases, he realizes that there may be a connection—answering his prayers in a most terrifying way.