We were (5) liars

The newspapers will always remember the three unfortunate youths who perished in the terrible fire at the Sinclair estate. The three teenagers with promising future.
The liars will never be the same again.

But let us flash-back to before the incident : the Liars were known for being a group of four. Always together. No matter what. Well, at least that's what the was reported by the press, wasn't it ?
Let me reveal to you that ours Liars were never four, but actually five.

And who better to uncover the truth the the fifth member of the group?