Final answer:
Offred knows of Ofglen's death through the secretive communication amongst handmaids in 'The Handmaid's Tale', a dystopian narrative by Margaret Atwood.
Step-by-step explanation:
Offred learns about Ofglen's death through the intricate network of communication the handmaids have developed to exchange information under the oppressive regime they live in. In The Handmaid's Tale, author Margaret Atwood uses the actions and dialogues between characters to reveal moving narratives that connect and sever the fates of these individuals. The dystopian society illustrated in the novel is marked by secrecy and surveillance, compelling characters like Offred to rely on rumors and subtle observations to understand the events around them, such as the fate of her counterpart Ofglen.