L. Lawliet is the World's Greatest Detective; the failure rate in cases he's worked on has always been 0%.

A genius since childhood, an antisocial individual who never sleeps and never tires.A genius since childhood, an antisocial individual who neither sleeps nor tires, L seeks justice even without any hope.

Interpol called L in to work on the Kira case.The detective set a trap for Kira, using a criminal (who was already on death row) to find out Kira's location. (Kanto, Japan)