Les héros de Qui ment ? (Nate et Addy) et Qui meurt ? (Phoebe) sont confrontés à une nouvelle menace : Jake, le complice de Simon, a été relâché ; et un message inquiétant est affiché devant le lycée de Bayview : " Dans ce jeu, il n'y a qu'une règle..." Quand des ados sont retrouvés, drogués et marqués d'un mesage, le Murder Club doit reprendre l'enquête. Simon n'avait peut-être pas livré tous ses secrets...

Life hasn't been easy for the Bayview Crew. First they had to prove they weren't killers. Then a new generation had to outwit a vengeful copycat. Now, it's beginning again. At first the mysterious billboard seems like a bad joke: Time for a new game, Bayview. But when a member of the crew disappears, it's clear this 'game' just got serious - and no-one understands the rules. Everyone's a target. And now that someone unexpected has returned to Bayview, things are starting to get deadly. Simon was right about secrets - they all come out in the end.