Once you send the money, you can not recover it again, it is gone forever, that is why they do tell people to be very careful before going ahead with this sort of transaction to avoid stories that touch.The truth is, it will be quite difficult to recover bitcoin sent to a wrong address. Except if you know who the owner of the address is, then you could talk and plead for him to transfer the bitcoin back. Otherwise, the receiver of the transaction is very likely not to resend the bitcoin back to you. However, if he is God fearing he could transfer it back to you when without asking.