Third-grader Aven Green has been solving mysteries for a really long time—a whole month! She has solved many important cases like The Mystery of the Cranky Mom, The Mystery of the Missing Ice Cream, and The Mystery of the Smelly Feet. Her record is nearly 100 percent, with only The Mystery of the Cereal in My Underpants remaining unsolved to this day. Aven asks all the right questions, wields her detective kit carefully, and follows up on every clue. Then her teacher’s lunch bag, with her lunch still in it, is taken, and Aven’s great-grandma’s beloved dog goes missing. 

Welcome to the town of Barksdale, where the canine residents strive for perfection. Every shopkeeper claims to be the "best groomer" or sell the "best biscuits". And at Barksdale Academy, the pressure is on every year for one pup to be named Best in Show. Nova, Duke, Harley, and Peanut have never won Best in Show...which is okay with them! But they have to work together to pass their Agility Exam, because either the whole pack passes or the whole pack fails.

Twelve-year-old Nimra Sharif has spent her whole life in Islamic school, but now it's time to go to "real school". Nimra's nervous, but as long as she has Jenna, her best friend who already goes to the public school, she figures she can take on just about anything. Unfortunately, middle school is hard. The teachers are mean, the schedule is confusing, and Jenna starts giving hijab-wearing Nimra the cold shoulder around the other kids. Desperate to fit in and get back in Jenna's good graces, Nimra accepts an unlikely invitation to join the school's popular eighth-grade boy band.

Eight-year-old Jasmine Toguchi is a flamingo fan, tree climber, and top-notch mess-maker! She's also tired of her big sister, Sophie, always getting to do things first. For once, Jasmine wishes she could do something before Sophie - something special, something different. The New Year approaches, and as the Toguchi family gathers in Los Angeles to celebrate, Jasmine is jealous that her sister gets to help roll mochi balls by hand with the women. Her mom says that Jasmine is still too young to join in, so she hatches a plan to help the men pound the mochi rice instead. 

It's time for the alpaca costume contest, and Abigail "Abbi" Wallace is excited to see it at the Maine State Fair. But there’s only one alpaca left—the rest are missing! What sent the alpacas packing? Abbi; her dog, Barkley; and her friends Lydia and Daniel are ready to sniff out this mystery!