If something is in the hands of somebody, it means it is their responsibility. You can put 'power into the hands of' someone for example, or 'leave someone in the capable hands' of someone knowledgeable. If someone has something 'in hand' it means they are dealing with it. 

1. The country has a lot of natural resources, but most of the revenue generated ends up in the hands of a wealthy elite without ever filtering down to the average person.
2. I felt very safe in the hands of Dr. Morar who is a specialist in skin disorders.

1. The recent turnaround of the business since the new manager arrived proves that, in the hands of the right person, the staff here are very capable.
2. The Research and Development team were worried that their plans for the new product could end up in the wrong hands. As a result, on-site security was increased.