After drinking with a friend, Richard heads home on the train at 7:30. He falls asleep, but wakes up just in time to get off at the right stop. Richard meets with a friend named Sachiko while walking home who offers to take him on a date to T?to Bay Bridge. They return two hours later to find Sachiko's roommate murdered. Conan suspects Sachiko and suggests that Richard missed his stop on the train and got off at 8:30 instead breaking Sachiko's alibi. But the decisive evidence is a pen which Richard picked up in Sachiko's car that has a fingerprints of a mail courier who dropped off a package at 8:00.