Just like the first two installments in The Curse Workers trilogy, Black Heart is engrossing, entertaining, and unpredictable. The plot is as spirited and intelligent as is its protagonist, who has just the right mix of irreverence, street-smarts, and sarcasm to appeal to teen readers. Part of Cassel's charm is that he is acutely aware of his own weaknesses, and the reader will identify with him as he struggles against his nature to do the right thing. Once again, Cassel is forced into impossible situations from which he uses his wits to emerge triumphant, without becoming a pawn for those who want to take advantage of him. While the premise of the story is fantasy, some content is mature, including murder, organized crime, one episode of underage drinking, and implied teen sex. Language is relatively mild (b-tch, b-stard, a-s, h-ll, d-mnit, sh-t). Fans of this fast-paced and suspenseful read will be left completely satisfied by the trilogy's conclusion.