The mysterious Plague Doctor has been committing arsons in and around San Francisco, and the police are clueless about who he really is. The main character has a habit of hiding things, and he even hides clues around the city. What he doesn’t know is that his partner, Constable Melinda Watson, is receiving the same notes.

Now, their lives are put at risk when they find themselves drawn into the Plague Doctor’s deadly game. The doctor has plans for them that may end their careers. He wants to turn them into his own version of Batman and Robin – but how can he make them his accomplices if they know nothing about his murderous schemes?

Look for objects hidden in a story that’s about to get dangerous. Try and solve the riddle before the detective and his partner are dragged into a deadly game.