You are on the right track !!!

Greg I am trying to figure out who the murderer is in this story.
CurtisWho do you think it is !
Greg I think it's Mr. Johnson because he was in the house at the time of the murder.
Curtis No, but you are on the right track.
Explanation :
If you are on the right track , you are acting or progressing in a way that is likely to result in success.
Example :
Guests are returning in increasing numbers - a sure sign that we are on the right track ...