「探偵とて休息は必要だ。だが―――
　謎の方が放っておいてくれるとは限らんが」

仮面の男事件解決を機に、ふらりと旅行に出た探偵ヱドモン。
立ち寄ったのは昔馴染みの店長がいる喫茶店。
昔話に花を咲かせる探偵だが、そこに謎の仏蘭西人から依頼が舞い込む。

それは探偵を故郷の地へと誘う、
ひとつの大事件の前兆であった―――

"Even a detective needs a moment of respite. That does not mean mysteries follow suit, however."

With the conclusion of the Case of the Masked Man, Detective Dantès takes a quick trip.
He visits a coffee shop run by an old acquaintance of his.
And while the detective reminisces about the good old days, a new request comes in from a mysterious Frenchman.

This particular request brings the detective back to his homeland, leading him to yet another grand case...