The Orange-Yellow Diamond

When an elderly pawnbroker is murdered in the London parish of Paddington, a young, down on his luck writer is accused of the crime. But then it's found the pawnbroker had had in his possession an extraordinary South African diamond worth over eighty-thousand pounds -- a diamond that's now missing. It falls to Melky Rubenstein to unravel the mystery and prove the young man's innocence. But what is...