Gabe Logan makes a dramatic return in Syphon Filter: Logan's Shadow. The sequel to the award winning action title, Syphon Filter: Dark Mirror and features all-new combat mechanics, weapons and an engaging storyline that will leave you wondering who to trust. In an all new story, written by Greg Rucka, Syphon Filter: Logan's Shadow provides a sophisticated and gripping storyline that is sure to resonate with comic book lovers and action enthusiasts. We find Gabe Logan once again using a combination of stealth and "run-and-gun" gameplay as he is called into action when a dangerous new technology is hijacked by a criminal extremist group. In a story that takes him from the depths of the Indian Ocean to the deserts of the Middle East, Gabe is faced with the possibility that his long time partner, Lian Xing is a double agent.
When Gabe reaches the bridge, Arleigh Burke-class destroyers with the Fifth Fleet have already begun launching cruise missiles to scuttle their own ship. He tries to stop Bitar from escaping, but terrorist Fahid Tamer distracts him. Gabe kills Fahid and escapes from the ship before it sinks. His return to the Agency brings more complications when Cordell mentions Lian was "never" in Cyprus, and produces pictures of her with a Chinese man, both in a foreign land. From Cordell's point of view, Lian being a defector or a double agent, the Agency would be compromised, and the NIOC suspends the IPCA.
Despite Teresa's reservations, and running out of options, Gabe enlists a marine salvage expert Dane Bishop to explore the sunken St Helens for NIOC courier files that could have the information of where Lian was when she was photographed. The duo find Russian Spetsnaz divers are also searching for evidence. Gabe realises they work for Surgei Kudrenko, another antagonist who survived an attempt that Gabe made on his life on a mission years prior. Bishop cuts a hole inside the ship, sucking Logan into the hull, and Gabe destroys the engine turbines to flood the chamber. When they rendezvous, the pair stop the ship's nuclear reactor from melting down and kill Kudrenko's right-hand man, Surgeyev, before the enemy can escape with the courier codes.
The decoded microfiles show pictures captured by MI6 in Azerbaijan. Lian and the Chinese male are hostages, but the Spetsnaz are also looking for them, suggesting they found out about the St Helens through their intelligence resources. Compounding the situation are the Russians who are conducting genocidal killings and ethnic cleansing activities throughout the country. Believing that Lian might get killed, Gabe teams up with Maggie Powers, who claims to be in the same region to "track smugglers", to find out who captured Lian. While searching a hotel room shared by Lian and her accomplice, Gabe encounters a Chinese Secret Service agent, codenamed Trinidad. The two fight and kill Spetsnaz forces, but Trinidad abandons Logan to find Maggie on his own. Although he rescues her from interrogators, Kudrenko captures them after they destroy a Russian gunship.
Inside a derelict gulag somewhere in Republic of Georgia, Trinidad confronts Gabe, the Chinese admitting that she was Lian's instructor in the MSS; but Xing defected when Gabe recruited her into the Agency, tarnishing Trinidad's reputation. According to Trinidad, her student used to be married to the man seen in the pictures, Shen Rei. The Chinese government wants him back because he is the inventor of the device stolen from the St. Helens, and Trinidad helps free Gabe from custody so he can find them. Logan wonders about the significance of the device, such that countries like America, Russia, China and Syria all want it. He begins to suspect Maggie is attempting to acquire it as well for England, and does not know whom to trust.
Gabe and Maggie stage an escape from the Russian prison, whereupon Gabe kills Kudrenko during an aeroplane firefight, but Cordell arrests Maggie and tells Logan he has shut down the agency; because the NIOC believes that Shen and Lian work for Bitar. Cordell had used Gabe from the very start to locate them. The NIOC now knows where al-Jamil's desert stronghold is, but Logan is forced to accept early retirement. Against his belief that Cordell is right, Teresa informs Gabe that Lian is in love with him, and must be Bitar's prisoner if none of the world powers have Shen. Gabe realises that Cordell will bomb al-Jamil's base, and it will kill Lian.
He assists several Army Rangers in the assault on an al-Jamil facility, but Gabe must enter the bunker on his own in search of Bitar. He finds Lian alive, and the two study Shen's device, the X-Z-2. It then transpires that the device is Shen's solution to the energy crisis, but China wanted to weaponize it. Unwilling to have such a peaceful instrument become a weapon of war, Shen defected with Lian's help and fled to Pakistan. Gabe finds information proving that Cordell hired Bitar as a means to bring Shen to NIOC couriers. Cordell was desperate to retrieve the X-Z-2 before competing nations could, but Bitar had other plans. The latter elected to steal the device and use Shen to make bombs that would destroy oil sources, thus driving Western influence from the Middle East.
Everything Cordell did since then was a cover-up, and Gabe has him taken away by soldiers to ensure his own early retirement. Lian has difficulty talking to Gabe about Shen, and Gabe focuses on stopping al-Jamil at a Syrian dam which Bitar will use to charge the last of the X-Z-2 devices for future attacks on the West. During the mission, Lian becomes distracted with saving Shen, and abandons her post to find him, rendering herself incommunicado in the process. Gabe reaches Shen first, and the two disable most of the X-Z-2 bombs before going after Bitar. The terrorist tries to escape with the final bomb, but Shen has rigged it as a dud. Gabe shoots the sabotaged device, destroying it and killing his adversary.