"You saw Sixty on the Santa Maria as she drew away from the Fruit Company's dock?"
"Ay, ay, sir, as plain as I see you, this blessed minute. The girl was with him, too."
"Did you see Motor Matt and his friends?"
"I wasn't lookin' for them, particular. They might have been on the deck, cap'n, but I wouldn't swear to it. I was so jolted up by seein' Sixty pull out when we wasn't expectin' it of him, yet a while, that mebby I was excited."
The captain, greatly perturbed, tramped back and forth across the dock. He was aroused from his unpleasant reflections by the voice of Cassidy.
"All aboard, cap'n! I reckon we pulled this off in short order, hey?"
The captain whirled around. Cassidy, standing in the top of the conning tower of the Grampus, was barely head and shoulders above the level of the dock. One of the hands, on the forward part of the rounded deck, had passed a rope through a ring and was holding the submarine steady.
"Pick up the luggage, Clackett," ordered the captain, himself taking charge of the bag of gold, "and we'll get aboard."
"What you goin' to do about Motor Matt?" queried Clackett as he picked up the luggage.
"He's aboard the Santa Maria, and I am convinced that, for some cause or other, he's there through some underhand work of Sixty's. Our orders call on us to follow the Santa Maria and keep watch of Sixty. By doing that, we shall also be trailing Motor Matt and his friends. Something is bound to happen that will give us a little light on this."