The struggle for control between the Armstrong twins and the group known as BZRK continues with the stakes higher than ever.

Tippi and Grace. Grace and Tippi. For them, it's normal to step into the same skirt. To hook their arms around each other for balance. To fall asleep listening to the other breathing. To share. And to keep some things private. The two sixteen-year-old girls have two heads, two hearts, and each has two arms, but at the belly, they join. And they are happy, never wanting to risk the dangerous separation surgery. But the girls' body is beginning to fight...

Meet Rose and Ruby: sisters, best friends, confidantes, and conjoined twins. Since their birth, Rose and Ruby Darlen have been known simply as "the girls." They make friends, fall in love, have jobs, love their parents, and follow their dreams. But the Darlens are special. Now nearing their 30th birthday, they are history's oldest craniopagus twins, joined at the head by as pot the size of a bread plate.
When Rose, the bookish sister, sets out...