Elektra: The Hand (Elektra: The Hand #1-5)

The Hand - few names have ever instilled such terror in the very soul of the Marvel Universe! Elektra witnesses a mystic ceremony that leads her to the never-before-revealed origin of the Hand, the world's most deadly assassins! In feudal Japan, a single murder fuels one young samurai's struggle for dominance - a struggle that will lead to the inception of this immortal ninja clan. And when a foreign merchant sends his beautiful daughter to learn the ways of the warrior, a cycle is set in motion that will change the Marvel Universe... forever!

Collecting Elektra: The Hand (2004) #1-5.