The Fatal Oath is the third book in the Oath series. Each book stands alone with separate main themes.

1957. Blackleigh is an elite public school for boys in Yorkshire where prejudice and seething hatreds are never far below the surface. Violence erupts against any Junior who the Seniors deem unfit.

Jonathan Simon is 16, in his third year, and is self-conscious about being Jewish and having a birthmark on his cheek. He knows that: 1) The school code of conduct mandates no snitching, 2) The student Prefects, not the faculty, have absolute power to discipline and 3) Mr. Paul Wood, the temporary Headmaster, is weak and ineffectual.

Jonathan meets Bobby Stuart, an American transfer student, who is also worried about being accepted. Their friendship binds them together as they soon run afoul three ruthless and ambitious Seniors in the House; Gabriel, Murray and Hausman – also known by their fanatic followers as 'The Black Armbands'.

As the pressure mounts, ambitions grow, friendships become closer and scheming increases. As for Jonathan, the year is only beginning...