When a dying man presses a blood-red key into Max Malone's hand and whispers, "It unlocks everything…", the Chicago PI finds himself caught in a deadly puzzle. The key leads to a locked room, a hidden fortune, and a trail of bodies — but every answer only raises more questions.
As Max digs deeper, he's hunted by gangsters, double-crossed by dames, and shadowed by a killer who will stop at nothing to get what the key unlocks. In a city where everyone's hiding something, the only thing deadlier than the secret… is the key itself.
Some doors should never be opened.
