Britain Where Is the Black Queen?

Police hope a chess code may unlock the riddle of a woman who vanished on a trip through Ireland

% A missing body, a map, a code. British mystery fans and chess buffs alike are turning from P.D. James and Agatha Christie this summer to a real-life riddle that police have yet to solve. Was Theresa Terry murdered? If so, where is her body? The riddle has drawn in the chess columnist for the London Times as well as dozens of would-be Sherlock Holmeses.

The victim: Terry, 43, was a widely traveled computer programmer from Lancashire who had returned to England from Australia to investigate the disappearance of funds from her bank account. In January, after telephoning a friend to...