Mouri is carried by Ran and accompanied by Conan one night picking him up from a bar. While walking they witness a fight in an apartment. The next day a murder occurs. One of the man who's heard arguing comes to Mouri for help to prove his innocence. The man has made good suggestions on where to find evidence which are in fact too good. Conan finds out the man is lying and is trying to trick Kogorou into proving his false allibi.