Book four in the tragic series about the Sinister-Winterbottom twins who must solve one
wretched mystery after the next brought to you by #1 New York Times bestselling author
KIERSTEN WHITE. The electrifying penultimate adventure finds the Sinister-Winterbottoms at the
manor of Mr. Frank and Dr. Stein! After escaping from Edgaren’t and Dr. Jay the
Sinister-Winterbottoms and their friends arrive at Stein Manor Science Camp. They all work
together to distract the friendly teenage camp director so they can explore and look for clues
about where their parents might be. Meanwhile Theo and Alexander settle on a daring plan. They
know exactly where Edgaren’t is going to be: coming for them and the books. This time they’ll
be ready. This time they’ll get answers. And this time they won’t trust the adult in charge
which is easy enough when it’s enormous lurking unfriendly Mr. Frank. But as they get closer
to opening the books and their parents’ histories an unexpected foe is watching everything
they do. . . . Fake volcanoes! Real sea caves! Strangely modified frogs! Startling betrayal!
And a lightning-struck manor! all combine for the electrifying penultimate Sinister Summer
adventure.
