German Three Investigators Curse of the Cell Phone and Mysterious Testament

In The Curse of the Cell Phone, several children disappear, leaving behind their cell phones.  The phones are not ordinary cell phones; each phone has a ringtone that is a witch's cackle and has special features, including one where the user gets shocked.  When one boy is found locked in a cage, he swears that a witch attacked him.  The Three Investigators are certain that some connection exists between the strange events and the cell phone company.

This book features a transgender character.  I do mean someone who is truly transgender and not as part of a deception.  It's not a significant part of the story, and I only mention it because it isn't typical of a series book.

The book may possibly have had an expletive, but if so, I didn't make note of it.

I enjoyed this story.

In Mysterious Testament, the boys learn that the art thief, Hugenay, has died when they receive a letter sent after Hugenay's death.  In the letter, Hugenay informs the boys that he hid several paintings worth millions of dollars.  Since Hugenay had no heirs, he decided to give the Three Investigators a chance to find the paintings.  Hugenay's letter contains a riddle.  Meanwhile, Justus takes an immediate liking to a girl named Brittany, but he soon learns that Brittany has a serious problem.

This book has a bit of a twist, because Justus decides to do something illegal in order to help someone else.  As in, Justus decides to do something very illegal. I would be spoiling the story if I were to be more specific, but suffice it to say that this book is a bit unusual.

This book contains no expletives.

Hitchcock is mentioned on page 10. 

In this book, the boys solve a puzzle just like they do in the early books by Robert Arthur.

Even though this book is abridged, it is very good.  It's quick to read, but very well written.