S.D. Smith's fantasy novel introduces Heather and Picket, two rabbit siblings whose peaceful life is shattered when their family is attacked and their world revealed to be embroiled in a secret war. The rabbits discover they are part of a larger story involving the lost kingdom of Natalia, the tyrannical Lords of Prey who conquered it, and the underground resistance working to restore rabbit civilization. Smith creates a fully realized world with its own history, culture, and political conflicts, drawing on traditions of animal fantasy from Watership Down to Redwall while maintaining his own distinct voice. The book explores themes of courage, loyalty, and the responsibilities that come with discovering one's hidden heritage. Heather emerges as a leader whose compassion and wisdom complement her brother Picket's more impulsive bravery. Smith, who self-published the first edition before the series became successful, writes with genuine affection for his characters and their struggles. The novel appeals to younger readers while containing enough complexity to engage adults, particularly in its treatment of political tyranny and the costs of resistance. The Green Ember initiated a series that has developed a devoted following among families seeking adventure stories that engage moral imagination. Smith's rabbits face genuine danger and make meaningful sacrifices, avoiding the sentimentality that can weaken children's literature.