What is the fine-grained topic of the following text: On the next episode of The CW's THE 100 titled "Long Into an Abyss" - Abby (Paige Turco) is determined to find a way to protect her people from a coming attack by the Grounders, even if it means heading into unknown territory and leaving some captives behind. Only return the topic.
Next episode plot of The CW's THE 100 titled "Long Into an Abyss".