Two glowing paper lanterns were sent into a twilight sky over a rural Nova Scotia town on Monday evening, a symbol of hope for the safe return of Lilly and Jack Sullivan, two young siblings who vanished without a trace one month ago.

Lilly, 6, and Jack, 4, have been missing since May 2, when police received a 911 call from their mother and stepfather reporting they had wandered away from their home in Lansdowne Station, a sparsely populated and heavily wooded area about 140 kilometres northeast …