Everything is too quiet when Ruby, Riley and Catriona go back to school. It sounds like bliss to the three amateur detectives. But from experience they know that it won’t last long. Niamh O’Reilly, a fellow student in Ruby’s class, posts nasty things about her classmates on Chatty, causing a lot of arguments and disgust. She shares secrets, bitchy comments and photos of her classmates in compromising situations, including one of Riley and an unknown girl. How will Ruby overcome this ultimate betrayal? Can Ruby and Catriona stay friends through these difficult times? Will Ruby forgive Riley? Who the hell is Niamh O’Reilly anyway and why is she hellbent on pushing everyone away? Ruby is determined to get to the bottom of this mystery and is prepared to go it alone if she has to. No one acts like this without a good reason. What is Niamh O’Reilly’s story? Will there be a happy ending?