Solve the math, solve the crime!
 
It's the first day of the 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 “the Abacus” Feldstein, Cameron “Cam” McGill, and Gabriel “Gabe” Kim—are on the case! Using arithmetic, geometry, and logic, the Prime Detectives are sure to figure out who did what, when, and why! A gripping new middle-grade mystery series, each book contains multiple, interlinked mysteries that readers help solve using math. Includes answers showing step-by-step solutions.
 
Contributor Bio(s)
 
Aaron Starmer was born in northern California and raised in the suburbs of Syracuse, New York. His middle-grade and young adult novels have been translated into multiple foreign languages and have appeared on best of the year lists from Time Magazine, The Wall Street Journal, New York Public Library, YALSA, Bank Street College of Education, Chicago Public Library, and School Library Journal. He lives in Vermont with his wife and two daughters.

Marta Kissi is a Bath-based illustrator, originally from Warsaw. She studied BA illustration & animation at Kingston University and MA visual communication at the Royal College of Art. Her favorite part of being an illustrator is bringing stories to life by designing charming characters and the wonderful worlds they live in. She shares her artist studio with her husband James and their pet plant Trevor.