Shepard is tasked with recruiting Kasumi Goto, a master thief operating on the Citadel — the colossal space station that serves as the capital of the galactic community. In exchange for joining the team, Kasumi asks Shepard to help her pull off a heist: breaking into the vault of a ruthless arms dealer named Donovan Hock. She explains that Hock murdered her partner, Keiji Okuda, and stole his graybox — a neural implant holding Okuda's memories along with the confidential, sensitive information he gathered over the years.