The Chase - The Jail Break

Inspector Donley gets a message on the intercom letting him know that Detective Neilson has arrived. Donley says "Oh, send him in right away". Neilson walks into the office. Donley says "Neilson?" He says "Yes, sir?" Donley says "I'm Inspector Donley. Come in sit down, and never mind the "sir", I'm beginning to feel old enough as it is. Have a good trip from the coast?" Neilson says "Oh, good enough if you like planes. Personally, I don't think they'll ever replace the horse". Donley says "A little bumpy, huh?" Neilson says "Well, we ran into a storm". Donley says "I brought you east because they tell me you're one of the best cops on the west coast. You've handled some tough assignments, but the one I'm asking you to take right now will probably be your toughest and most dangerous. You may want out and I wouldn't blame you if you did. I've got your return ticket to LA here in my desk". Neilson says "Um, well suppose you tell me about it, and let me think it over". Donley asks "Ever hear of Red Monks?" Neilson says "Yes, wasn't he mixed up in running narcotics?" Donley says "Narcotics was only a hobby. He took a crack at everything in the book. We finally picked him up as a fourth offender, but we haven't got his boss. We're sure he was working for someone. A Mr. Big who controlled three-fourths of the rackets between here and Chicago". Neilson asks "Where do I come in?" Donley says "I'm sending you on a chase, Neilson. A chase for information and it may be the roughest chase you ever entered. I picked you for the job for two reasons. One, your record, and two, and just as important, you're not known here on the east coast". Neilson asks "What's the setup, inspector?"  Donley says "Now, we just picked up a con named Johnny Hagen several days ago. He's got a long list of suspected felonies and we can put him away for a long time. His arrest hasn't been made known. Hagen was a lone wolf, who always worked by himself. Very few of the underworld have ever seen him". Neilson says "You want me to impersonate him? Is that the deal?"