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There
is no
hint
of
either
mystery
or
danger
in the
routine
assignment
handed
to Ken
Holt
and
his
friend,
Sandy
Allen,
one
brisk
autumn
evening.
Sandy's
father,
owner
and
editor
of the
Brentwood
Advance
has
sent
them
to
cover
a
purely
social
event
- the
annual
Halloween
party
for
the
employees
of the
Brentwood
Foundry
and
Casting
Company.
Even
Sandy,
whose
nose
for
mystery
can
sniff
trouble
miles
away,
scents
nothing
more
dangerous
in
their
immediate
future
than
the
possibility
of
eating
too
much
of the
tempting
food
at the
festive
buffet
supper.
But
before
the
evening
is
over,
Ken
and
Sandy
find
themselves
agreeing
to
match
wits
with a
criminal
- an
extortioner
who
quickly
proves
himself
even
more
clever
than
the
boys
at
first
suspect,
who
seems
to
anticipate
their
every
move
to
uncover
his
identity.
It
is
only
when
their
lives
arc in
jeopardy
that
the
boys
realize
their
invisible
adversary
is as
deadly
as he
is
clever.
Trapped
and
helpless,
Ken
and
Sandy
face
the
fact
that
their
enemy
will
stop
at
nothing
to
ensure
the
success
of his
criminal
scheme.
Readers
who
relish
the
chill
of
suspense
and
the
thrill
of
mystery
will
find
plenty
of
both
in The
Mystery
of the
Invisible
Enemy.
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