Mass Effect 2, "Kasumi's Stolen Memory" is an inventive sub-story that steps away from all the galactic peril just long enough to explore the motives and traits of a newly recruited squad mate. The downloadable add-on introduces Kasumi, a cocky human thief in search of data relating to a former partner (in crime?), and sees Shepard accompanying her on an important and incredibly dangerous two-person mission. You know, a date.
Donning a sleek bit of evening wear and a false identity, Shepard accompanies Kasumi to an exclusive party -- the kind that requires either a shiny invitation or a shady conscience. While the commander mingles, a cloaked Kasumi keeps an eye out for the hidden art vault that she believes holds her partner's grey box. What they eventually find encroaches upon spoiler territory (that's especially sensitive given the 90-minute length of the mission), but unsurprisingly triggers one of Mass Effect 2's intense combat sequences.