gain.

Well, what had Paul Brennan to gain?

Money, for one thing--he would be executor of the Holden Estate. But
there wasn't enough to justify killing. Revenge? For what? Jealousy? For
whom? Hate? Envy? Jimmy Holden glossed the words quickly, for they were
no more than words that carried definitions that did not really explain
them. He could read with the facility of an adult, but a book written for
a sophisticated audience went over his head.

No, there was only one possible thing of appreciable value; the one thing
that Paul Brennan hoped to gain was the device over which they had worked
through all the long years to perfect: The Holden Electromechanical
Educator! Brennan wanted it badly enough to murder for its possession!

And with a mind and ingenuity far beyond his years, Jimmy Holden knew
that he alone was the most active operator in this vicious drama. It was
not without shock that he realized that he himself could still be killed
to gain possession of his fabulous machine. For only with all _three_
Holdens dead could Paul Brennan take full and unquestioned possession.

* * * * *

With daylight clarity he knew what he had to do. In a single act of
destruction he could simultaneously foil Paul Brennan's plan and ensure
his own life.

Permanently installed in Jimmy Holden's brain by the machine itself were
the full details of how to recreate it. Indelibly he knew each wire and