Once a month, for Mario Cassar, who received a “socket” as punishment for committing a crime, a room opens in which he may choose exactly one stone. Onyx? Forty-four days of life. Ruby? Thirty-two. Topaz? Fourteen. And only one gemstone can help “socket-people” regain full life—sapphire. But how do you find it if all the stones in the room are… colorless?