The two detectives Thomas and Betty are in the house of Wilson family. Last night there was a murder in the house. Namely, while the other members of the family decided to go on a shopping, mister Wilson stayed at home with intention to take a rest. The other members of the family were not in the house for a certain period of time and when they came home, they found a very unpleasant sight. They found mister Wilson's dead body. The family is in panic so they called the police right away.

Now the detectives are on the place of the crime scene, looking for something that will help them find out who is responsible for the murder. It seems that the only evidence about the case is the silhouette seen by a certain passenger, someone who was just passing by the window in the time of the murder.

Now it is time to collect every possible trace, to look for everything that could lead to the killer and put him where he belongs. The two detectives have a very difficult task as always but they will do their best.