Little Secret is a Highschool series revolving around 4 characters, Arianna Jones, Cole Grant, Tasha Jones, and Kylie Kimmer. 

Arianna Jones (Ari) is a sweet 11th-grade girl from a small town, who is just trying to fit in and find her place. Ari is constantly bullied by Tasha's best friend and her boyfriend. One day, while being bullied, Ari meets Cole, who saves her from the bullies. The two become friends, and later begin dating, which is the cause for all the drama in this series.

Cole Grant is an undercover FBI Agent assigned to protect Ari, and to find the culprit for a major plot. During his mission, Cole falls in love with Ari, which makes a certain someone jealous...

Tasha Jones is Ari's sister, who is extremely jealous of Ari because she knows that Cole likes her. Tasha goes to crazy lengths that include her hurting the people around her, in order to get cole for her self.

Kylie Kimmer is Ari's best friend, and well, basically crazy. She keeps the series light and fluffy, and adds the comedy part.