It ’s the first day of fourth grade at Arthimos Elementary and things are already off to a strange start – poisonous cookies, a zipline disaster, a missing iPad, and what are those strange sounds coming from the school custodian’s wheelbarrow? Luckily the Prime Detectives – Abby, Cam and Gabe – are on the case! Using arithmetic, geometry and logic, the three are sure to figure out who did what, when, and why. A page-turning mystery brimming with intrigue and middle grade math skills that will have readers on the edge of their seats as they unravel the mysteries – perfect for kids who love puzzles, riddles, brainteasers and adventure.