Bob Andrews rounds out the trio of the
Three Investigators as being in charge of records and
research. Despite this modest title, Bob has his own
unique role in the early books. In fact, it is Bob that
appears on the first page of "Terror Castle"
and helps give us details on the formation of the Three
Investigators in their first adventure. Bob also serves
as the clue-bearer for many of the adventures, either by
research at the library (in "Screaming Clock,"
Bob is the first one to see the light on how to solve the
written message left by Albert Clock/Hadley because of
his research at the library) or by getting words of
wisdom from his father (Bob's father points out in
"Stuttering Parrot" that a graveyard is where
dead men would guard a treasure).
In the first few stories, Bob is hampered physically by a leg brace that he wears due to multiple fractures inflicted when he rolled down a stretch of hill. The leg brace, coupled with Bob's job at the library, made it a natural conclusion that he would be better suited for the research end of the firm. Bob's leg brace is removed between the end of "Whispering Mummy" and the beginning of "Green Ghost," (Robert Arthur describes its removal in the early pages of "Green Ghost") making him more able to take on physical activities such as shadowing suspects, fleeing from dangerous scenes, etc.