Sammy Keyes and the hotel thief

Sammy (real name Samantha) is a middle schooler who has an ability to solve cases and this time, she had came across a case of a hotel thief.
One day, Sammy was looking through her grand mother 's vinocular, she saw a guy with black gloves on and stealing money through a purse in the Heavenly hotel.
Threatening letter on Double dynamo(ice cream store) napkins, suspects on Sammy by a police officer, chase, trap___ so many mystery elements inside the Sammy's adventure! Who is the hotel thief?