Final answer:
In Charles Dickens' novel 'Great Expectations', the character Magwitch's escape is ruined by the master-at-arms and the sentinels who prevent him from reaching the magazine.
Step-by-step explanation:
In Charles Dickens' novel Great Expectations, the character Magwitch attempts to escape from prison, but his plan is ruined by the master-at-arms. The master-at-arms releases the prisoners confined in the after-hold, giving them a chance to escape. However, the sentinels stop them from reaching the magazine, and the prisoners are unsure whom to trust among the unfamiliar faces they encounter. This ultimately ruins Magwitch's escape.