A young submarine captain with ties to the V.F.D. reveals she's looking for the sugar bowl. But so is Esmé Squalor, who's on a mission to find it first.

With Sunny's fate hanging in the balance, Violet and Klaus race to find a life-saving antidote and learn the location of the Last Safe Place.

The final chapter takes the orphans to a deserted island: a place of lost lives, old stories and new beginnings. It all ends here.