Final answer:
In the 'Red Rising' series, Tamara of House Diana is convinced to ally with Darrow due to a shared secret, which emphasizes the importance of trust and mutual understanding in forming alliances.
Step-by-step explanation:
The character Tamara of House Diana from the science fiction series Red Rising is convinced to ally with the protagonist, Darrow, by a shared secret. This pivotal moment in the story illustrates the power of trust and information in the shaping of alliances within the intricate societal structures depicted in the series. The main answer is that a shared secret serves as the crux for Tamara's decision, highlighting the character's values and the narrative's emphasis on the bonds formed by shared experiences and mutual understanding. This turning point in the narrative is crucial as it marks a significant alliance that influences the subsequent events in the series.