Nine million people trust the code. Nobody knows who wrote it. Someone just woke it up.
When forensic cryptanalyst Nora Vance finds a message hidden in the world's most famous digital wallet - signed with the key of a creator who vanished thirteen years ago - she assumes it's a hoax. It isn't. It's an invitation. A dead man's puzzle. Twelve seats. Five keys. A fifty-billion-dollar prize that someone will kill to control. From a data vault beneath an Icelandic volcano to a raked garden in Kyoto, Nora and two unlikely allies race through five layers of a cipher built to answer one question: can the last key be held by someone who refuses to hold it? But one of the twelve is not who they say they are. And the billionaire funding the hunt wrote the rules. The ciphers Nora breaks are real. An appendix shows how every one of them works - and one message the book won't decode. Trust nothing. Verify everything. Then decide who to trust.