Hester Monk, the wife of William Monk, commander of the Thames River Police, questions the finances of a London church whose members' hard-earned charitable gifts appear to have ended up in the pocket of charismatic preacher Abel Taft. Taft is accuse of extortion, and brilliant barrister Oliver Rathbone, newly appointed a judge, is chosen to preside over his trial. It seems clear that Taft is indeed guilty. However, at the last second, the defense produces a witness who completely undermines the charges. Then Rathbone makes a well-meaning but reckless move that could ruin his career, his reputation, and his life.