The vanishing girl - Josephine Ruby

It's the classic girl detectives like you've never seen
them before! Daphne Blake and Velma Dinkley have a terrifying
new mystery to solve - and this time, the culprit is far more
frightening than any man in a mask...

Popular Daphne Blake and ber-nerd Velma Dinkley are not
friends. They aren't enemies either, but they don't have any reason
to speak to each other and that's how they prefer it. The two
girls grew up together - they'd been best friends since pre-school
- but when they hit middle school, Daphne dropped Velma
and never looked back.

These days, Daphne's deep in the popular crowd, daughter of the
richest family in town, while Velma's an outsider, hiding from
the world behind her thick glasses. When they run into each other
in the halls of Crystal Cove High, they look the other way. But
then Daphne's best friend, Marcy - who happens to be Velma's
cousin - goes missing.

A century ago, there was a wave of disappearances in Crystal Cove
and many local people believe that supernatural forces were behind
it. Now the whole town believes those same forces are back
... and up to no good. Daphne and Velma may be the only ones who
can solve the mystery and save Marcy - if they can trust each
other enough to try.