A possible concise summary is:
This is a story about Bianca, a teenage heiress who is afraid of falling in love because of her parents' divorce. She meets Slater, her best friend Carmen's cousin, who is actually an undercover detective looking for a mafia gang. Slater pretends to be clumsy and interested in Bianca to protect her and catch the criminals, but he also develops real feelings for her. Bianca is suspicious of Slater's identity and tries to expose him, but she also falls for him. They have several adventures and mishaps, including running from rabid dogs, jumping from a rooftop, and fighting off Travis, Bianca's obsessed admirer. Slater finally confesses his love and asks Bianca to be his girlfriend.
Here are some key facts extracted from the text:
1. The narrator is Bianca, a teenage heiress who is incapable of falling in love and likes to have adventures.
2. Travis is a popular boy who flirts with Bianca and tries to kiss her, but she rejects him by making a cat scratch his face.
3. Slater is Carmen's cousin who joins their school and acts clumsy and weird around Bianca, but also tries to protect her from danger.
4. Bianca recognizes Slater as an undercover artist who she saw at an art show and suspects he is lying about his identity.
5. Slater is actually a detective who is looking for an international mafia gang that Bianca unknowingly encountered at a club and has been in danger ever since.
6. Slater and Bianca have several close encounters and end up kissing, but Bianca is afraid of losing Carmen's friendship and falling in love.
7. Slater confesses his feelings for Bianca and asks her to be his girlfriend before she leaves for a vacation with her mother.