Thief at the Gym

Well, it seems that there is no such thing as a completely safe place. The police officers Betty and Charles come to one of the city gyms after a report that someone has been stealing the personal belongings of the people who exercise there. Generally, gyms are safe places. People visit them without worries like this, but it seems that nowhere is completely safe. The police officers have a task to find out who is the thief at the gym. Is it someone that visits the gym to exercise, or maybe someone that comes there purposely - to steal? It can be someone from the staff or who knows? The officers are starting without any concrete evidence, without a trace that tells them where to begin but they are prepared to do their job perfectly, searching everywhere and interrogating everyone that might be related to the crime. Let\'s explore the whole situation and try to help Betty and Charles in their work. The gym should become a safe place again, and that won\'t happen if we don\'t explore every aspect of the whole situation, right?