her previous course. The abrupt, swerving motion finished the stranger.
With a groan, he slumped forward in his seat, and bowed his head on his arms.
Joe sprang up. With one bound he reached the man with the gun.
The stranger realized what was happening, and struggled to his feet. He raised the weapon, but Joe struck out and dashed the revolver from his hand. It described a flashing arc, then fell into the water with a splash.
Sick as he was, the man swung out viciously and his fist caught Joe on the side of the face, staggering him. Joe quickly recovered himself and plunged forward, grappling with the man. They swayed to and fro in the middle of the boat, then fell, still struggling.
But although Joe was young and wiry he was not strong enough to cope with his antagonist and Frank soon saw that the stranger was having the better of the battle. He glanced ahead, saw that the Sleuth was heading into a long, low bank of fog but that there were no other boats in sight, then abandoned the wheel.
He leaped back to the assistance of his brother, crooked his elbow about the stranger's neck, and dragged him back. The man struck out, wildly, twisted around and staggered Frank with a blow in the ribs. He managed to
