Ronald “Cheesie” Mack and his best friend, Georgie, are about to graduate fifth grade and embark on the best summer ever, which will include, but not be limited to, making points in a private battle against Cheesie’s evil older sister June, hanging out in their treehouse and, most importantly, summer camp in Maine. Summer’s only a day away, and things already seem to be off to a great start when Georgie finds an old necklace and a 1909 penny stashed in their basement. Then bad news hits big: Georgie’s dad’s been laid off, and they can’t afford camp. Cheesie decides to be a best friend and stay home too, so summer’s looking lame-ish. First, they have to get through the boring graduation ceremony; Georgie (as usual) has a plan to spice it up. When a possibility arises to get the money for camp, the boys have to decide what course of action is right. Readers will be happy to learn that Cotler’s debut is the first in a new series. Cheesie chattily narrates his own story; his voice rings true, and the other characters are a gently quirky, appealing lot. His periodic invitations to read posts on or add stories to the CheesieMack.com website will hook denizens of the digital generation, but doing so isn’t vital to enjoying the ride. No art was seen, but the final book will have many fun illustrations (according to Cheesie) from Time Warp Trio illustrator McCauley. (Fiction. 8-12)