Maddy Smith and her family are hiding something living in a small English town. They are werewolves also known as Wolfblood. Not even her best friends Tom Okanawe and Shannon Kelly know although Shannon has been researching local legends of a beast in the woods. The three outcast friends have their school's photography club. She is taken with new kid Rhydian Morris. He's a foster kid who turns out to be another Wolfblood. The group is later joined by Jana who left her wild pack. The Smith family is driven out as Dr. Whitewood closes in on them at the end of series 2. Wolfblood-run corporation Segolia helps relocate the Smiths and they are written out of the show. Series 4 has wholesale changes with Jana taking the lead with new friend TJ and dim-witted Katrina as one of the few hold-overs. Series 5 has Jana and her friends dealing with the aftermath of revealing their secret to the world.
Who knows why Aimee Kelly left the show after series 2. It's terrific teen drama up until that point. Series 3 struggles a bit as Jana is given more material until she is given the lead. At the end of series 3, she has a great episode as the alpha of her wild pack. If series 4 had followed that episode, the show would be well served. It probably could have kept some more of the cast as the pack tries to integrate with the human world. Instead, the show chooses to press refresh on almost everything. Jana is a good character and Leona Vaughan does a terrific job taking over. I'm not convinced that the transition actually worked or was ever necessary. By coming out of the closet, the world becomes too big for the show. All the flaws in this fictional world are showing. This can't survive as a world wide supernatural show.