If you are looking to hire us to spy on your employees internally its important that you be detailed.
Please tell as much as you can about WHY you want to hire a corporate spy for your particular company? How long will the assignment be? Do you require the agent to have any special skills (ie. knowledge of computers or accounting practices)? Do you suspect one or more employees are defrauding the company? Have you obtained permission from HR/management to hire a corporate spy?
The more information you give us the more readily we can help you.