He was cheated by Estragon's assistant Vash after he paid for information about the Tox Uthat. In 2366, he followed her to Risa where he periodically searched her room when she left and offered her gold for the information on a data disk she had. He observed her with Captain Jean-Luc Picard, who was holidaying on Risa at the time, and thought he was conspiring with Vash. Unknowingly, Picard did not understand what was happening until later. He confronted Picard and Vash as they were leaving the resort to look for the artifact. Picard disarmed him and knocked him out. Sovak later found the half-burnt disk copy in Vash's room, leading him to the same cave they were heading to. He found them and ordered them to dig for the relic. Due to Vash's deception, the artifact wasn't there, and Sovak eventually convinced himself the information was false and left. (TNG: "Captain's Holiday")
Background information Edit
According to the script, Sovak's name was pronounced as "SOE-vauk". 
His mirror universe counterpart appeared in the novella "The Worst of Both Worlds". He was a rival of his fellow archaeologist-for-hire, Luc Picard. On September 28, 2371, Sovak followed Picard to the ruins of a Vulcan monastery on New T'Karath so that he could procure the second fragment of the Stone of Gol for himself with a minimum of either effort or risk. However, when he attempted to remove the fragment from the sarcophagus, he inadvertently activated a trap left by the ancient Vulcans, namely a gravitron inverter which caused his body to liquefy. As the trap had been triggered, Picard was able to safely retrieve the fragment, which he presented to his patron Gul Madred, the governor of the Klingon-Cardassian Alliance world Celtris III.