Just when you thought things couldn't get any worse . . . A teacher has gone rogue, Nick's sister is in danger, and Holmes is missing. The last thing the detectives need is another problem. But now a secret warning involving a mysterious green monkey has come to light and Amanda must investigate. Too bad she won't get the chance to discover what it means. Just as she begins to make progress the Moriarty brothers re-emerge, and they're mad, bad, and unstoppable. They're also coming for her.