Adddress: Miami, FL 33179 Phone: (786) 310-4191 Grey Ghost Investigations has a strong record of successfully completing infidelity investigations. Our private investigation case manager will speak with you to gather all information about your significant other, such as: their schedule, physical description, work address, vehicle information, recent changes in behavior and possible ‘friends’. The more information you provide, the easier the easier and more affordable the process will be.