He decides he has to find out who he swapped with, who murdered Chaney for him. It wouldn’t have been hard. A little snooping and he’d discover that Eric Atwell had been questioned by police in regard to a motor vehicle accident that took the wife of Malcolm Kershaw. Not only that, but Malcolm Kershaw works at a mystery bookstore. He’d even once posted a list of eight perfect murders in fiction. It included Strangers on a Train.
Why did he need to spell this out again? He does it a third time when he confronts the murderer
