Seller wont let me put the house under contract.

[LeJon Ratchford]

I have a number of houses that a seller is looking to sell. I was trying to whole sale one of them, but they will not allow me put it under contract so I could present them to my buyers. I am afraid to show the home to buyers and present them with all the information. I am afraid they will go around me. I think it is time for me to walk away. Any suggestions on how to handle this situation?
LeJonR