 However , Garrett finds Truart murdered at his estate . Evidence at the crime scene leads him to spy on the police officer Lt. Mosley . Garrett sees Mosley deliver a suspicious letter , which is carried through a portal by a wounded pagan . Garrett enters the portal and finds himself outside the City , and he follows the pagan 's trail of blood to Viktoria , who persuades Garrett to join her against the Mechanists . On a lead from Viktoria , he infiltrates Karras ' office to learn about the " Cetus Project " , and inadvertently discovers that Karras is giving Servants to the City 's nobles . Garrett travels to a Mechanist base to find out more about the Cetus Project , which is revealed to be a submarine . In order to locate and kidnap a high @-@ ranking Mechanist named Brother <unk> , Garrett stows away in the vehicle . 
