The Maze Investigators have reached the final message from the medium Claire Lewis—about a young Scot who traveled to Spain in 1938 and disappeared without a trace, leaving behind only a strange, enigmatic message. Maggie returns to Catalonia, to a story heard on her first trip three years before which now has a significance she didn't understand or appreciate at the time. Further revelations lead back to Glasgow and a long hidden crime. Back in Wales, the final confrontation with the Quinn and McCarthy Miller families is looming. There has to be a winner. Can anyone emerge unscathed?