Almost too much history for a single mind to absorb has happened above the sand and gravel of Thorney Island. Yet, in Robert Shepherd, a very fine mind has sifted the archaeological, institutional, political and human débris with such skill and clarity that the rest of us can absorb this abundant Wesminster "biography" with pleasure and instruction. As someone who works in the great gothic Palace which rests upon that history-soaked reef, I shall never look upon my patch in the same way again.