nine o'clock
Mysterious visit of mysterious man at dead of night to remove the said papers . A ring that could n't come off the owner 's finger mysteriously lost . Mysterious burglary on night of the murder by mysterious burglar who left all windows and doors locked behind him and took nothing away . Mysterious perambulations of his garden every night at nine o'clock by Mr. Simon Rattar . '' `` Great Scot ! '' murmured Cromarty . `` I have given you the items in what turned out to be their order of date , but I got them higgledy-piggledy and served up in a sauce of mystery and trembly sensations that left me utterly flummoxed as to how much -- if anything -- was sober fact .