Harry started to speak, then made a warning gesture.

Then he made a movement, but Poirot flung up his hand in a warning gesture.

He raised one hand in a warning gesture and said in a low voice: "The police are here."

Grace stopped her by a warning gesture of the hand.

Fenring made a subtle warning gesture to get his attention.

The Shadow looked toward the wooden crate and gave a warning gesture.

Janet made a warning gesture with the gun, but Bob merely smiled.

Before he could speak I made a warning gesture.

She stopped, putting out her hand in a warning gesture.

With them was The Shadow, his hand raised in a warning gesture.