Weapon by Lynette Noni

The #1 bestselling WHISPER series concludes with WEAPON:

I already knew he was a psychopath. But now?
He’s more dangerous than ever.
And I have less than twenty-four hours to stop him.

After escaping Lengard and finding sanctuary with the Remnants, Alyssa Scott is desperate to save those she left behind ─ and the rest of the world ─ from the power-hungry scientist, Kendall Vanik. But secrets and lies block her at every turn, and soon Lyss is left questioning everything she has ever believed.

When long-lost memories begin to surface and the mysteries of her past continue to grow, Lyss battles to retain her hard-won control. Allies become enemies and enemies become allies, leaving her certain about only two things: when it comes to Speakers, nothing is ever as it seems… and the only person she can trust is herself.