What is the main conflict in book crocidile tears-alex rider?

The main conflict in the book "Crocodile Tears" by Alex Rider is between Alex Rider, a teenage spy, and Nikola Drevin, a powerful Serbian war criminal. Drevin is responsible for the deaths of Alex's parents and has been hiding from justice for many years. Alex is determined to avenge his parents' deaths and bring Drevin to justice, while Drevin is determined to destroy Alex and protect himself from capture. The conflict between the two characters drives the plot of the book and leads to several dangerous situations and thrilling action sequences.