A possible summary is:
Kendra is a girl who has to pretend to be her brother Kevin, who ran away from their controlling father, to save their company from humiliation. She gets help from Kevin's best friend Cedric, who is also her crush, and his girlfriend Loren, who becomes her friend. Along the way, she learns more about Kevin's passion for photography and his secret island adventures. She also finds out that Cedric likes her back and they end up together. She decides to leave her father and join Kevin in his travels.
Here are some key facts extracted from the text:
1. The narrator, Kendra, woke up in the middle of the night and saw her older brother Kevin entering a mysterious door in the basement.
2. Kevin ran away from home and left a note saying he didn't want to be found.
3. Kendra's father asked her to pretend to be Kevin at a gala and at school to avoid ruining his business reputation.
4. Kendra got help from Cedric, Kevin's best friend, and Loren, Kevin's girlfriend, to impersonate him.
5. Kendra developed feelings for Cedric, but also became friends with Loren.
6. Kendra found out that Kevin was passionate about photography and had been visiting different islands to take pictures.
7. Kendra decided to join Kevin and leave their father's company behind.
8. Cedric confessed his love for Kendra and they kissed.