the taxicab had got under way; nor was
it until the machine had passed the Greystoke residence at good speed
that Carl, with a heavy blow to her face, had succeeded in knocking her
to the pavement.

Her screams had attracted servants and members of the families from
residences near by, as well as from the Greystoke home. Lady Greystoke
had witnessed the girl's brave battle, and had herself tried to reach
the rapidly passing vehicle, but had been too late.

That was all that anyone knew, nor did Lady Greystoke dream of the
possible identity of the man at the bottom of the plot until her
husband told her of the escape of Nikolas Rokoff from the French prison
where they had hoped he was permanently confined.

As Tarzan and his wife stood planning the wisest course to pursue, the
telephone bell rang in the library at their right. Tarzan quickly
answered the call in person.

"Lord Greystoke?" asked a man's voice at the other end of the line.

"Yes."

"Your son has been stolen," continued the voice, "and I alone may help
you to recover him. I am conversant with the plot of those who took
him. In fact, I was a party to it, and was to share in the reward, but
now they are trying to ditch me, and to be quits with them I will aid
you to recover him on condition that you will not prosecute me for my
part in the crime. What do you say?"

"If you lead me to where my son is hidden," replied the ape-man, "you
need fear nothing from me."

"Good," replied the other. "But you must come alone to meet me, for it
is enough that I must trust you. I cannot take the chance of
permitting others to learn my identity."

"Where and when may I meet you?" asked Tarzan.

The other gave the name and location of a public-house on the
water-front at Dover--a place frequented by sailors.

"Come," he concluded, "about ten o'clock tonight. It would do no good
to arrive earlier. Your son will be safe enough in the meantime, and I
can then lead you secretly to where he is hidden. But be sure to come
alone, and under no circumstances notify Scotland Yard, for I know you
well and shall be watching for you.

"Should any other accompany you, or should I see suspicious characters
who might be agents of the police, I shall not meet you, and your last
chance of recovering your son will be gone."

Without more words the man rang off.

Tarzan repeated the gist of the conversation to his wife. She begged
to be allowed to accompany him, bu