midnight
Only those letters remained to connect him with the river tragedy ; or rather to show that he had communicated with the unfortunate Mrs. Courtenay . In company we walked to Leman Street Police Station , one of the chief centres of the Metropolitan Police in the East End , and there , in an upper office , Ambler had a long consultation with the sergeant of the Criminal Investigation Department . I described the appearance of the body , and stated my suspicions of poisoning , all of which the detective carefully noted before going forth to make his own examination . My address was taken , so that I might assist at the post-mortem , and then , shortly after midnight I drove back westward through the City with Ambler at my side . He spoke little , and when in Oxford Street , just at the corner of Newman Street , he descended , wished me a hurried good-night , and disappeared into the darkness . He was often given to strange vagaries of erratic movement . It was as though some thought had suddenly occurred to him , and he acted at once upon it .