Next time when I find someone on internet saying "I'm just stating my opinion" while being extra rude, I'll give them link to this chapter instead.
On another note, Ellie!
@Ynneja People unfortunately will do anything out of jealousy. I've seen my mother tormented for years by her co-workers just because the most popular guy in her workplace keep hitting on her despite ALL of people involved still having their spouses around.
He's really getting rusty if he can't recognize such obvious horror plot points lol.
So one of the current visitors is the college student with a handprint at the beginning of the chapter?
Sakura's motive rant at page 25 actually has a reiteration of Gentleman Thief's MO, something along the line of this:
"I swore to myself I would never forgive those who stole not only my father's paintings but also his life and end them with my own hands" or something.
This will look like a nitpick, but the related optical illusion closest to what Kindaichi explained that I've read is this: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6083800/
Looks like the poisoned cake is the model's and it somehow got given to the hairdresser or something? There's a hint of "obsessed fan eating what their idols eat" vibe here.