"An older sibling teaches a new younger sibling about their family's traditions, all of which revolve around chocolate"--

Cass's mom is kidnapped by the evil dessert chef, Señor Hugo, who requests the legendary tuning fork as ransom, leading Cass and Max-Ernest to try finding the magical instrument in time.

"It was spring in New Mouse City! I love to celebrate the season with my fellow mice by exchanging chocolate eggs and competing in a confectionary challenge. This year, there was also a special exhibition of priceless jeweled Mouseberge eggs in town. Then the Mouseberge Egg was stolen--and it was up to me to find it! Squeak! Could I chase it down?"--Page 4 of cover.