Counterstrike (1990)

Stasch Janic, who is Alexander's old friend, sends his daughter, Carmilla, who is a raising tennis sensation and Alexander's goddaughter, to a excellent tennis coach and a family friend after her old coach, Trevin, is stabbed after a tennis match, which Carmilla has just won. Alexander sends Stone and Sinclair to Yugoslavia with Stasch in the event that a death threat should actually be realised. At the same time, Gabrielle accompanies Camilla to her new tennis training campus ran by Vlad. During her stay, she discovers something very strange is going on and drags Sinclair and Stone back to New York once everything in Yugoslavia has been wrapped up. In the process of the investigation into Vlad, the team discovers that Vlad is involved in blood dopping.