Detailed Instructions: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Problem:Passage: Arthur "Cody" Jarrett is a ruthless, psychotic criminal and leader of the Jarrett gang. Although married to Verna, he is overly attached to his equally crooked and determined mother, "Ma" Jarrett, his only true confidant.
Cody and his gang rob a mail train in the Sierra Nevada mountains (referred to as "the tunnel job"), killing four members of the train's crew. While on the lam, Cody has a severe, instant migraine, which Ma nurses him through. Afterward, Ma and Cody have a quick drink and toast, "Top of the world!" before rejoining the others. The gang uses the cover of a storm to change hideouts and split up. 
Informants enable the authorities close in on a motor court in Los Angeles where Cody, Verna, and Ma are holed up. Cody shoots and wounds US Treasury investigator Philip Evans and makes his escape. He then puts his emergency scheme in motion: confess to a lesser crime (the "hotel job") committed by an associate in Springfield, Illinois at the same time as the tunnel job - which was federal crime - thus providing him with a false alibi and assuring him a lesser sentence. He flies to Illinois and turns himself in, where he receives one- to three-years in state prison. This ruse does not fool Evans, however, who plants undercover agent Hank Fallon (aka prisoner Vic Pardo) in Cody's cell in the Illinois State Penitentiary. His task is to find the "Trader", a fence who launders stolen money for Cody. Hank's angle is to become a surrogate "ma" to Cody and get him to talk.
Solution:
Which crime gives the leader of the Jarrett gang a false alibi?