The Bells of Saint John

When Clara Oswald has problems with her Internet, she’s given a telephone number: the number of “the best help line in the universe.” When the Eleventh Doctor answers at the other end, Clara is pulled into a life of adventure and mystery. But danger is lurking in the signals, picking off minds and imprisoning them. “It’s like immortality, only fatal.” But can the Doctor save Clara before… “I don’t know where I am.”