Final answer:
Grimm helps Agatha escape from the tower by distracting the guards and disabling the security system.
Step-by-step explanation:
In the story, 'The Diamond as Big as the Ritz' by F. Scott Fitzgerald, the character Grimm helps Agatha escape from the tower by distracting the guards and disabling the security system. He does this by pretending to be a government inspector and gaining access to the tower. Once inside, he creates a diversion, allowing Agatha to escape unnoticed. Grimm's quick thinking and resourcefulness ultimately enable Agatha to get out of the tower.