Young Dexter Morgan struggles to keep his urges in check while navigating life with his father, Harry, and sister, high-school senior Deb. After Harry has a health scare, Dexter realizes it may finally be time to fulfill his destiny.
Dexter targets a retired mob hitman (who may still be killing), as Harry works the gruesome murder case of a ten-year-old boy; Deb sneaks into a nightclub with Sofia and meets an exciting new friend.
After a kill goes wrong, Dexter is grounded by Harry; Deb deepens her relationship with Gio, and bonds with her brother on the anniversary of their mothers death.