in the hands of
In the possession of; in the custody or under the authority of. For example, In the hands of the decorator the hall was completely transformed. [Late 1200s] Also see in hand; in one's hands.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.