"Where and when can I meet this mysterious person?"

Sarah is soon bothered with phone calls from a mysterious person, saying "I've been waiting for you."

Ramsey states his belief that the mysterious person will strike again.

The mysterious person who rolled the rocks down at you?

However, halfway through the party, a mysterious person shows up.

A mysterious person from an unknown place who appears in the series.

There's some mysterious person wandering around your house in a robe and all you can say is 'that's nice'?

A mysterious person sang songs on the stage when everyone had gone home.

Throughout the book, he plays chess with a mysterious person, each time making one single move.

The mysterious person who took a shot at him.