Vishweshwaran
Vishweshwaran asked Paul G. Bens Jr.:

PLEASE REPLY. Regarding "Decagon House Murders" I read the prologue and your reply. What actually happened? Did Shimada find out about Morisu's true character by opening the bottle? Who was the person who found the bottle and asked a boy to deliver the bottle to Morisu???

Paul G. Bens Jr. Sorry, been off-line. Morisu wrote the letter (his confession) and placed in the bottle in the prologue, assuming, I suppose, that it would land somewhere far away.

At the end, when Shimada comes up and Morisu and Morisu walks away, Morisu finds the bottle has washed back up on the same shore when Shimada is there. In essence, his confession has come back to haunt him.

It is left open to the reader's imagination what it means when Morisu tells the boy to take the confession to Shimada but I take it as Morisu believing he was meant to confess and "confessing" by having it delivered to SHimada.

In essence, Morisu is turning himself in.

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