The house of Dunbar, Dunbar, and Balderby, East India bankers, was one of the richest firms in the city of London--so rich that it would be quite in vain to endeavour to describe the amount of its wealth. It was something fabulous, people said. The offices were situated in a dingy and narrow thoroughfare leading out of King William Street, and were certainly no great things to look at; but the cellars below their offices--wonderful cellars, that stretched far away underneath the church of St. Gundolph, and were only separated by party-walls from the vaults in which the dead lay buried--were popularly supposed to be filled with hogsheads of sovereigns, bars of bullion built up in stacks like so much firewood, and impregnable iron safes crammed to overflowing with bank bills and railway shares, government securities, family jewels, and a hundred other trifles of that kind, every one of which was worth a poor man's fortune.