Trying to hear whispers on audio recordings

I recorded my wife when I left for work because I believe she’s having an affair. She knows that I set up recorders and if she is cheating, she knows to be quiet and have background noise to cover her whispering. All I get on the recordings is whispering with background noise from the TV, shower, etc… I played around with a free editing software and was able to hear a lot better. I got lucky adjusting the sounds one time, but need a pro to clean it up and amplify the whispers so I can hear what’s being said. I have 4 recordings that are about 10 minutes long. What would that cost? Text me at 510-688-8812
Thank you,
Darren