The Unbreakable Code
50 pages • 1-hour read
Jennifer Chambliss BertmanThe Unbreakable Code
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Background
Historical Context: Gold Rush and Chinese Immigrants
A major historical thread woven into The Unbreakable Code is the California Gold Rush, specifically the often overlooked contributions and struggles of Chinese immigrants during that time. The Gold Rush began in 1848, just as many Chinese citizens were seeking opportunities abroad due to severe hardship at home. High taxes following the Opium Wars, political instability, and repeated crop failures created economic distress across Southern China, prompting many workers to leave in search of better prospects. When word of gold in California reached China, thousands made the journey across the Pacific.
By 1852, over 20,000 Chinese immigrants had arrived in California in a single year. In the region known as the “Southern Mines,” they made up roughly one-fifth of the population. Most came with the hope of earning money to send home or start new lives, but they were met with widespread discrimination. That same year, California imposed a Foreign Miners Tax aimed primarily at Chinese miners, requiring them to pay fees simply to work. This legalized prejudice fueled violence, theft, and systemic exclusion. Chinese immigrants were often denied the right to testify in court or defend themselves against mistreatment, and their presence was regularly resented by white miners who viewed them as competition. Tensions escalated over the decades, and by 1882, the US passed the Chinese Exclusion Act—the first significant federal law to bar immigration based on nationality. It effectively halted Chinese immigration and further entrenched anti-Chinese sentiment for generations (“Chinese Immigrants and the Gold Rush.” PBS, 10 Oct. 2017).
In the novel, this history gives context to the code, which was invented by a Chinese gold miner using bilingual, culturally coded elements.
Series Context: The Book Scavenger Series
The Unbreakable Code is the second installment in Jennifer Chambliss Bertman’s Book Scavenger series, a mystery-adventure saga centered around book lovers, ciphers, and literary puzzles. The series begins with Book Scavenger, in which readers first meet Emily Crane, a 12-year-old who has spent her life moving from city to city with her adventurous parents. The story picks up as Emily’s family relocates to San Francisco.
Emily is a devoted participant in Book Scavenger, an online game and literary treasure hunt invented by the eccentric publisher Garrison Griswold. At the beginning of the first book, Mr. Griswold is mysteriously attacked on his way to announce a new game. While he lies in a coma, Emily and her new neighbor James—a cheerful, code-loving boy whose family owns the building where Emily lives—discover a rare book by the American horror and mystery pioneer Edgar Allan Poe. Griswold had been carrying the book at the time of the attack. Suspecting that it holds clues to the unannounced game, they begin to decode its puzzles.
As Emily and James follow the trail of clues across San Francisco, they encounter rival scavenger teams and face real danger. Ultimately, they uncover a hidden, unpublished Poe manuscript. Their discovery helps reignite interest in Griswold’s game and earns them recognition from the game master himself, who has woken from his coma. More importantly, it helps Emily convince her parents to settle down in San Francisco instead of continuing their transient lifestyle.
By the time The Unbreakable Code begins, Emily is more rooted in her new life and community. However, new mysteries emerge—Griswold has returned but seems different, fires are breaking out throughout the city, and Emily finds herself drawn into another literary mystery, this time involving a historical code and the legacy of the Gold Rush. The second book builds on the relationships and themes of the first while layering in deeper emotional and historical stakes, continuing Emily’s journey as both a codebreaker and a community member.
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