Flawless; Perfect

So my sister's gotten me hooked on these damn Pretty Little Liars series. I finished the second and third. "Flawless" explained the "Jenna Thing", which was that Ali caught Jenna's stepbrother Toby sexually abusing her and accidentally aimed the firework that blinded Jenna. Toby took the blame for the firework in exchange for Ali not telling what he was doing to Jenna. Toby is now back and the girls think he might be the mysterious "A" who is sending them threatening texts and emails. Toby commits suicide near the end, so nope, he wasn't A. "Perfect" kind of throws Spencer's older sister, Melissa, in as a suspect for A, but in a fit of rage Spencer blacks out and nearly kills Melissa, putting her in the hospital, so she's out as a suspect. Hanna seems to have figured it out at the end and calls the other girls and asks them to please meet her at the park so she can tell them what she's found out. The girls gather but before Hanna can reveal who A is a car runs her over, and we are left to assume she has been killed.