This excluded not only intruders in human form but also bombs or other infernal devices.

"Yes, and the expression on her face could have launched one of Father's infernal devices."

How long has your master been served by these infernal devices?

"I want to hear John's latest progress report on his infernal devices."

I think you all should stay here and figure out what the hell happens when somebody tries to turn that infernal device off.

Now, tell me what you require to lay this ghost and his infernal device.

The Professor held the watch at arm's length, handling the thing as if it were an infernal device.

Will the players discover the infernal device before it's too late?

Even more maddening was the growing number of deaths directly attributed to these infernal devices.

If I need to pick your brain some more about this miserable infernal device, I'll call you again.