I am hundred per cent sure about it
"John, my dear grandson. I know that you are not a coward. Yes, I too do not want to push anyone of my family to any danger. But, I think you have already realised that it is not easy to catch him by yourself. He would not come out from his hole so easily. We have to take some risk and plant some traps for him. If he would somehow come to know that, someone is searching for the map again, in the old house, he would come out and try to get it again. It would be easier for you to find out him by that."Mrs Smith said in a calm voice.
Mrs Smith did not really mind John's words. She knew that John is only trying to protect them from the enemy. She could not blame him for his unwillingness to let others do anything against Lucas.
Hearing her, John sat there silently. He lost in the thoughts. Mrs Smith knew that John needs some time to sort out the things properly.