What is the climax of Echo by Pam Munoz Ryan?

In "Echo" by Pam Muñoz Ryan, the climax occurs when the three main characters—Friedrich, Mike, and Ivy—face pivotal moments that intertwine their stories. Each character confronts personal challenges that test their resilience and courage, with Friedrich standing up against the oppressive regime in Nazi Germany, Mike fighting against the limitations placed on his family, and Ivy striving to find her voice despite adversity. This convergence of their struggles highlights the themes of hope, courage, and the power of music, culminating in a moment of connection that underscores the novel's message about the impact of art and empathy.