Whisper

You touch your Earring of Whisper and whisper a message. Any creature within range wearing a linked Earring of Whisper hears the message and can reply in a whisper that only you can hear.

You can cast this spell through solid objects if you are familiar with the target and know it is beyond the barrier. Magical silence blocks the broadcasted message. The spell doesn't have to follow a straight line and can travel freely around corners or through openings.