There was another thought which had been continually hovering of late about Raskolnikov's mind, and causing him great uneasiness. It was so painful that he made distinct efforts to get rid of it. He sometimes thought that Svidrigaïlov was dogging his footsteps. Svidrigaïlov had found out his secret and had had designs on Dounia. What if he had them still? Wasn't it practically certain that he had? And what if, having learnt his secret and so having gained power over him, he were to use it as a weapon against Dounia?

This idea sometimes even tormented his dreams, but it had never presented itself so vividly to him as on his way to Svidrigaïlov. The very thought moved him to gloomy rage. To begin with, this would transform everything, even his own position; he would have at once to confess his secret to Dounia. Would he have to give himself up perhaps to prevent Dounia from taking some rash step? The letter? This morning Dounia had received a letter. From whom could she get letters in Petersburg? Luzhin, perhaps? It's true Razumihin was there to protect her, but Razumihin knew nothing of the position. Perhaps it was his duty to tell Razumihin? He thought of it with repugnance.

In any case he must see Svidrigaïlov as soon as possible, he decided finally. Thank God, the details of the interview were of little consequence, if only he could get at the root of the matter; but if Svidrigaïlov were capable... if he were intriguing against Dounia--then...

Raskolnikov was so exhausted by what he had passed through that month that he could only decide such questions in one way; "then I shall kill him," he thought in cold despair.