In this chapter we have two episodes of murder;
1. Ahazyahu, King of Yehuda is assassinated by Yehu ben Nimshi in the mutiny at Jezreel
Seeing that the king, her son, is dead, Attalya takes the reigns of power and rules Yehuda,
2. But then we see baby Yoash who is snatched from a "the murdered" in the palace in Jerusalem, and is hidden by his aunt for 7 years.
