Signs as book series

Aries: Percy Jackson

Taurus: Harry Potter

Gemini: The Mortal Instruments

Cancer: Twilight

Leo: Lord of the Rings

Virgo: Hush, Hush

Libra: The Vampire Diaries

Scorpio: Fifty Shades

Sagittarius: Hunger Games

Capricorn: Divergent

Aquarius: The Maze Runner

Pisces: The Selection