In Chapters 13 to 17 of Bram Stoker's classic novel "Dracula," the suspense and horror intensify as the characters find themselves drawn deeper into the web of the malevolent Count Dracula's schemes. These chapters continue to unfold the story through a series of diary entries, letters, and journal entries from various characters.

Chapter 13: In this chapter, the group of protagonists led by Professor Van Helsing faces the grim reality of Lucy Westenra's vampirism. They take action to confront and ultimately destroy the undead Lucy, a deeply unsettling and emotional moment for the characters.

Chapter 14: The group's determination to stop Count Dracula's reign of terror grows stronger. They continue to gather information about the vampire and devise a plan to locate and eliminate him.

Chapter 15: As the group gets closer to discovering Count Dracula's whereabouts, tensions rise, and their pursuit becomes increasingly urgent. The suspense builds as they edge closer to their confrontation with the ancient vampire.

Chapter 16: This chapter delves deeper into the psychological toll the vampire hunt is taking on the characters, particularly Mina Harker. The relentless pursuit of Dracula begins to take its toll on their physical and mental well-being.

Chapter 17: The final preparations are made for the climactic showdown with Count Dracula. The group's determination and courage are put to the test as they venture into the heart of darkness, ready to face the ultimate evil.

These chapters are pivotal in the development of the plot, showcasing the growing threat of Dracula and the unwavering resolve of the characters to confront the vampire menace head-on. The tension and horror continue to mount as the story hurtles towards its dramatic conclusion.