John asked Zinu to search for the location of the library beforehand so that she could go there directly to search for the clues.
As per Mrs Smith, she brought everything with her during the shifting of the house. She only left some old diaries and books, which are belonged to Oliver Smith in the library of that house. So if she had left anything important, that it must be in the library.
Although Zinu was fully prepared for the plan, she had to do it very carefully. Lucas might be installed some hidden cameras everywhere.
John knew that it would be risky for Zinu, to go inside of any other room, other then the rooms allowed her to enter as a waitress. So he instructed Dolly and Charlie to make a gadget, which can deactivate any recording option of the camera for some time so that they could use it in the room, where she would be searched for the clues. But they could not stop the recordings for a longer time, otherwise, Lucas could get alerted.
