Source plot synopsis — includes the ending
Upon learning the Sicilian Mafia were helping disrupt operations at the dockyard to slow down the shipment of the weapon parts, Fairburne meets with kingpin Salvatore Dinelli who agrees to provide additional assistance after eliminating Piero Capo, leader of the local Black Brigade. Distrustful of the Mafia's intentions, the Partisans are reluctant to maintain the alliance. However, when an SOE informant, Major Hans Dorfmann, reveals that Kessler is at the Magazzeno Facility where the missiles are assembled, Fairburne infiltrates the base to kidnap Kessler and steal his research notes. On interrogation, Kessler tells Angel her father is still alive, prompting the Partisans to depart to assault the town of Giovi Fiorini and find Böhm's confidant Major Klaus Rothbauer. Kessler then tells Fairburne that he is dying of liver cancer due to his heavy drinking and is of no use to the Nazis or the Allies as a result, and that the information given to Angel was a lie in order to lure the Partisans into a trap. Fairburne departs to Giovi Fiorini and eliminates Rothbauer, but the ensuing battle results in the Partisans being massacred.
Gathered intelligence allows the SOE to discover Böhm is aware of Operation Avalanche and has the constructed missiles sent to his personal fortress at Allagra, intending to both inflict enough damage on the fleet to prevent the invasion of Italy from being a success while additionally attempting to kill General Dwight Eisenhower. Fairburne infiltrates the base, disabling each of the missiles. As he attempts to call in a bombing raid on the facility, Dorfmann appears with a captured Angel, revealing himself to be Böhm. Böhm executes Angel and quickly departs to his advanced jet plane, the Fiegler, intending to take off and personally carry out the attack on Eisenhower's ship. Fairburne gives chase and succeeds in shooting out the plane's engines before it can take off, destroying the plane and killing Böhm just as the Allied Lancaster bombers arrive to destroy the base. In the epilogue scene, Jack offers Karl a job in the OSS and Karl says he will think about it.
Sources and content license
Source and revision history ↗ · Adapted from Wikipedia contributors, Sniper Elite 4. Section headings and formatting adjusted. · Content license