Mimi's Treasure Trouble (Mimi's World, Bk. 2)

Mimi and her best friends Yoshi, Tonya, Boris, Hunter, and Sofie have formed the Gum Club, a special club where they eat gumballs from Boris’s gumball machine, recite the special Gum Club Promise to always stick together, and talk about important things, like the tunnel they are digging behind the Periwinkle Tower where they might even find dinosaur bones or buried treasure.

But when Mimi finally unearths an old chest buried in the tunnel wall, she makes a bad decision - a decision that shocks her friends and causes her to break the Gum Club Promise. Suddenly it seems the Gum Club bubble has burst! Can the Periwinkle Tower pals ever be best friends again?