In other cases imps were simply kept in a certain object and summoned only when their masters had need of them. Some even had the ability to grant their owner's wishes much like a genie. This was the object of the 1891 story The Bottle Imp by Robert Louis Stevenson, which told of an imp contained in a bottle that would grant the owner their every wish, but their soul would be sent to Hell if they didn't sell the bottle to a new owner before their death.