not necessary, trust me it took a little while for me to figure it out also even after reading the walkthrough. This game is a bit grindy, enjoyably so. Unless you enjoy the grind so much you want to restart, seriously read the walkthrough and give it a few hours. Remember when they say Monday at 12am-5am that means you have to be staying at the inn whether that be through renting or doing the Claire peeling potatos thing. You will see that the owner of the Inn is not in bed. Then go down to the cellar. You will need to have gotten the Claire event done to the point where you have received the lockpick and training from Bianca. You will need to break into the inn owner's room and find the crack in the wall. Some of these quests are really involved so my advice is even if you are a social learner this quest in particular is hard to learn socially.
My advice, read the walkthrough this games quests are that hard to find. If you don't I could imagine some people spending twice or even three times the amount of time I did finding and completing the quests. Especially if those people have the completionist mindset. I've played 11 hours to complete the current content. That time is also because I enjoyed the grind. I could see somebody who read the walkthrough completing a speed run in 4-6 hours or maybe less if they are a good speed runner. Especially since enemies seem to level with you.