New Moon
New Moon is the second book in the Twilight Saga.
New Moon was first published in 2006.
Summary, as seen on the copyright page of New Moon, first edition:
When the Cullens, including her beloved Edward, leave Forks rather than risk revealing that they are vampires, it is almost too much for eighteen year-old Bella to bear, but she finds solace in her friend Jacob until he is drawn into a "cult" and changes in terrible ways.