in the hands of (someone)
1. Under the care, supervision, or direction of someone. It just goes to show that, in the hands of the right director, even the most ridiculous premise can make for a great movie. In the hands of our expert choreographer, you will be dancing like a professional in no time.
2. Possessed or controlled by someone. The country still maintains a rigid aristocracy, with most of the region's resources in the hands of a few wealthy elites.