This title is suitable for children aged 12 years and up. In this action-packed thriller sequel to "Envy", foreign exchange student Olivia Grant is stabbed to death after a party and the prime suspect is her best friend. But is everything as it seems? As twins Hayley and Taylor Ryan get pulled into aftermath of the crime, they realise nothing is what it seems. Could it be betrayal of the ultimate kind? Betrayal features real-life crime-solving techniques, heart-stopping suspense, plenty of red herrings and hard-hitting ethical questions. As the crime unravels, so does the twins' past, as they must face off against a family member who may unexpectedly have carried out the worst betrayal of all.