In response to earlier provocation, Shibazaki is challenged with a riddle this time only he can solve in order to stop the bomb from blasting but at one condition, no one can cheat.
The FBI gets involved with the Sphinx case. A fake Sphinx makes an announcement with a riddle, the riddle leads to an airport, the real Sphinx, not wanting to be known as mass murderers, try and stop the bomb.
All the detectives that went to the airport get suspended and taken off the Sphinx case. Sphinx's safe house gets blown up by Five. Kenjirou Shibazaki continues investigating. Lisa is captured by Five.