Temperance Brennan gave birth to two beautiful and healthy baby girls. They were the light of both Brennan's and Booth's life. Now fifteen years down the line and hormonal troubled and rebellious teenage girls, does Brennan and Booth still think they are the light of their lives? Trouble brews for the Booth family and when a serial killer murders three girls around the same age as the twins, will Booth over-react and maybe ruin his relationship with his daughters? Will Brennan be able to hold the family together while trying to catch a crazed lunatic?