Conan contacts Heiji to assist him from Osaka. When Heiji arrives at the scene of the drug deal, he finds three people wearing or holding white roses. Heiji transmits images of the three people to Conan using his cell phone.

Conan finds out that the man falling into the river wasn't an accident but a murder attempt. The main suspects are: the man's wife (who he was on the phone at the moment of the crime), his partner, and one of the contestants whose sister was having and affair with him.