What is the plan to get Boo Radley to come out? How well does the plan work? Why?

The next day, Jem and Dill hatch a plan to leave a note for Boo in the Radley's window, using a fishing line. The note will ask him to come out sometimes and tell them what he's doing inside, and that they won't hurt him and will buy him ice cream. Dill says he wants Boo to come out and sit with them for a while, as it might make the man feel better. Dill and Scout keep watch in case anyone comes along, and Jem tries to deliver the note with the fishing pole, but finds that it's harder to maneuver than he expected.