Kendrick had been deeply troubled for weeks. No matter how many times he changed the security code to his house, Libby somehow continued finding a way inside. Every time he thought he had finally secured his home, another incident would happen, leaving him confused and frustrated.

The situation had become even more disturbing because Kendrick was certain that the new security code was known only to him. He had never shared it with Libby, and he had made sure that nobody else around him knew the updated code.

Kendrick began questioning everything. Had someone secretly given Libby the new code? Was there a problem with the security system? Or was Libby using another entrance that he had completely overlooked?

He knew there had to be an explanation. Changing the code again would not help if Libby had discovered another way into the house.

There was one thing that made the situation even stranger. The family dog always seemed to notice Libby before anyone else did.

Whenever Libby appeared, the dog would become alert and immediately move toward her, almost as if it sensed that she was not supposed to be there. Sometimes it would stand between Libby and the rest of the house, while other times it would bark and try to stop her from moving farther inside.

But somehow, Libby always managed to get past.

Eventually, Kendrick decided that changing the security code again would not solve the real problem. If Libby was somehow entering the house without using the code, he needed to discover exactly how she was getting inside.

One night, instead of leaving the house or going to bed as usual, he decided to secretly wait inside. He turned off most of the lights and positioned himself where he could watch the entrances without being noticed.

The house became completely quiet.

Kendrick remained still, listening carefully to every sound. The ticking of the clock seemed unusually loud in the silence. Every small noise made him wonder whether Libby had finally arrived.

Minutes passed. Then more time went by. Kendrick began to wonder if his plan had failed.

But then he heard something.

Kendrick immediately became alert.

He stayed where he was and carefully watched the entrance. At first, nothing seemed unusual. Then he noticed a shadow moving near the back door.

Someone was there.

Kendrick’s heart began beating faster as he realized that the moment he had been waiting for had finally arrived.

He watched silently as Libby appeared near the back entrance. She looked around carefully, making sure nobody was watching. She seemed completely comfortable with what she was doing, as though she had entered the same way many times before.

Kendrick could hardly believe what he was seeing.

Libby reached into her pocket.

She pulled out a key.

He had changed the security code, but he had never considered that Libby might have another way into the house.

Libby inserted the key into the back door and slowly unlocked it.

The door opened.

She stepped inside.

Kendrick finally understood everything.

The security code had never been the real problem.

Libby had apparently obtained a duplicate key to the back door. That meant she had been able to enter the house without knowing the new security code at all.

Kendrick remained hidden as he watched her walk farther inside.

His mind was racing.

How long had she possessed that key? Who had helped her make the duplicate? Had she been entering the house for days, weeks, or even longer?

Suddenly, all the strange incidents that had confused Kendrick began to make sense. The unexplained appearances, the security system that seemed useless, and the dog’s repeated attempts to stop Libby were no longer mysteries.

Kendrick felt a mixture of anger, disbelief, and betrayal. He had trusted the security system to protect his home, but the real problem had been something much simpler—a physical key that Libby apparently had no permission to possess.

He watched as Libby moved farther into the house, completely unaware that Kendrick had already discovered her secret.

For the first time, Kendrick had proof.

He no longer had to wonder how Libby kept getting inside.

He knew exactly how she was doing it.

But now another question remained.

Why had Libby gone to such lengths to keep a duplicate key?

What exactly was she looking for?

And how long had she been entering Kendrick’s house without his knowledge?

Kendrick knew that confronting her immediately might reveal too little. He wanted to understand the full story before making his next move.