Dimitri did good on his promise, the special team had arrived at the location ahead of Tristan.
The special team belonged to the Mafia family and they worked in dangerous environments all the time, involved with search and retrieval, facing death every day, so for them finding Ava will be a piece of cake.
The Santoris special team is the best in the world. Nobody can make use of their services aside from the Aristocratic families. So when Tristan asked Dimitri for help, he agreed right away.
Each minute Tristan spent inside the car on his way to see Ava was hell for Tristan. For the first time in his life, he was scared to death, he could not imagine something bad happening to Ava, he just found her, and he was not ready to live life without her.