about eight o’clock
When Rouletabille had seen me into the train , he said : `` You 'll remember the address ? '' `` Yes , -- Cassette , 6a , Opera . Rely on me ; you shall have word tomorrow morning . '' That evening , on reaching Paris , I saw Monsieur Cassette , dealer in walking-sticks and umbrellas , and wrote to my friend : `` A man unmistakably answering to the description of Monsieur Robert Darzac -- same height , slightly stooping , putty-coloured overcoat , bowler hat -- purchased a cane similar to the one in which we are interested , on the evening of the crime , about eight o'clock . Monsieur Cassette had not sold another such cane during the last two years . Fred 's cane is new . It is quite clear that it 's the same cane .