Its about a brother and sister sleuth duo.
Of the 12 books i manage to check 11.
of those 11 there are 3 books with a treatment.
of those 3 books there are 5 different treatments.
of those 5 treatments there are 3 full treatments.
Book 1, The nanny/babysitter get tied up and gagged when playing with the kids
Book 3, The kids get caught and end up tied up in the basement, when they free themself they escape but instead of going to the police they follow the badguys with results with getting captured again, the pick are shown of them tied up and gagged while getting carried away, the second picks is of the kids in the truck still tied up and gagged.
Book 7, The same badguys break into a house and the dumb one goes into the badroom.
When back he says he found a woman tied up and gagged (pick show what the smart guy thinks of whenthe dumb guy says a bound and gaged woman)
When he check it out, he indeed sees a woman tied and gagged(now a pick of the woman)
The owners come back and they leave, later in the book its revealed the woman got tied up and gagged when 2 kidnappers kidnap the kid of that house.
The main kids find the kidnappers and manage to tie them up in a store.(last pick)
