All through the Night' sees the return of two of Mary Higgins Clark's best loved characters: Alvirah and Willy, amateur sleuths who are caught up in a mystery that calls on all their skills and experience. Willy has been looking forward to playing Santa at the after-school centre set up for children of working parents, and Alvirah has been busy with rehearsals for the Christmas pageant. But suddenly a shadow falls upon the Christmas cheer. The centre is threatened with closure, a deathbed legacy gives the promised replacement home to others, a valuable chalice - long missing - is spotted at the centre before disappearing again, and a desperate woman turns up, begging for help tracing the baby she abandoned seven years before. And in a final blow, the young girl who is to play Mary in the Christmas pageant vanishes without a trace