<p><strong><em>Black Gold</em> is the third book featuring Cyrus and Rudy’s adventures on the farm, following <em>Not for Sale</em> and <em>Blackberry Juice</em>.</strong></p><p>Cyrus and Rudy spend the last days of summer selling dahlias, blackberries and tomatoes at their roadside stand. When a neighbor drops off a bin full of red wigglers, California earthworms that break down compost into fertilizer, Rudy and Cyrus become worm moguls as they discover just how in demand the <em>Eisenia fetida</em> are.</p>