Sign in to http://infamouspapertrail.com/ and go to the profile view. Proceed to examining traces obtained in the game, namely Origami Dove #1, Crime Scene Photos and the Detective's Wallet. Examining the dove and the pictures will not reveal anything noteworthy. When it comes to the wallet, the game will allow you to further examine the objects inside (most of them are random). Take a look at the business card that belonged to the murdered detective.
The e-mail address found at the detective's business card will direct you to another fake website: http://brunbergdetectiveagency.com - it is best to open it in a separate browser tab. Just as in the case of the previous website, you need to log in by entering the data from the recently created account or your Facebook account. Go to the bottom of the page and click on the login button for detective agency employees.
Enter emiliob username and then click on password retrieval. The game will ask you to answer three personal questions set by the detective, and these are, unfortunately, randomly selected. The solution is waiting for you back at the http://infamouspapertrail.com/, because by examining items from the wallet you can find hints on the correct answers. This could be, for example, his dog's name or his favorite restaurant. Enter the correct answer into the following fields (capital letters are not necessary) and send the form to get access to the account.
Click on the only case available. You can read here the information from all the tabs or go directly to the one with Killian Czalov's phone ID number (fourth item from the top). Save the number in a text file or leave the detective agency website tab open.
Visit http://infamouspapertrail.com/ once again and select the last item from the list, that is Delsin's Phone. Enter the number you acquired from the detective agency database, click on Submit button and wait for confirmation. You can now launch the game and take on the second mission.