The trial to bring the Professor's murderer to justice has barely concluded when the indicted marionette Systelia appears before you. Fugitive and Supervisor — an unlikely team — begin hunting for the truth together. Inside the Institute's sealed experimental sector, evidence emerges of a past experiment and a mysterious figure holding the city's deepest secrets. When gunfire finally shatters the last semblance of peace in Astrum Close, one question remains: who or what is in the line of fire?