Used when actions happen without others' knowledge, often leading to a surprise or reveal. Unbeknown to him, his coworkers had decorated his office for his birthday.
Pro Tip 2/3
Silent Observers
Indicates someone or something is observing or influencing secretly. Unbeknown to the actors, the director was watching the rehearsal from the back.
Pro Tip 3/3
Subtle Twists
Can add an element of twist or irony to a story or situation. Unbeknown to the thief, the wallet he stole was actually empty.