In which the swaggering Sim Tappertit leads a secret society of apprentice locksmiths through a midnight initiation steeped in theatrical oaths, grisly symbols, and mischievous vengeance against oppressive masters. Within the dank and dismal cellars of Barbican, these young fellows find mirth and solemnity alike, plotting in whispers amidst skittles and skulls the restoration of their ancient rights.