The Curious Case of Benjamin Turner is issue 34. It is issue number four of Volume 6 and issue ten of season ten.
Answers, revelations, and returns!
Prue, armed with the knowledge of what she has become, decides to take charge of her situation... leaving Kyra with a whole new world at her fingertips. Meanwhile, when Coop and Henry's actions come to light, the Charmed Ones find themselves divided.