The Green Toenails Gang (Unabridged‪)‬

Olivia Sharp, cousin to super sleuth Nate the Great, is a detective too! Rather than solve mysteries like Nate, Olivia helps friends with their problems by detecting what's wrong beneath the surface. You'll be won over by Olivia's spunk, eccentricities, and can-do spirit.

Olivia Sharp is one smart agent for secrets--which means she knows how to read between the lines. Olivia's best friend, Taffy Plimpton, has a problem. Taffy wants to join a secret club, but its members won't let her in. Why not? It's a secret that Olivia is determined to find out!