Go to the Mangano Summer Home on the north side of town and hide behind the stack of crates in its small courtyard. When Mangano's guard approaches, Death Strike him and grab the key off his corpse.

Angie's on the second floor of the Great Hall. If you agree to help her get her term paper back, she'll point you in the right direction. Go find Lisa's room, which is one of the only unlocked rooms ...