Claire Lorrimer 
Silver Link 

Until her father died, Adela Carstairs had lived in a secure and loving home. Then happiness was shattered when her mother remarries a cruel, hard-drinking man. With her younger brother and sister, Adela is forced to flee his drunken rages and they escape to London where they seek refuge in the squalor of the back streets. Addie’s desperate hope is that her childhood companions, the Mallory twins, will find and rescue them. When all three find themselves caught up in the danger and terror of revolutionary France, the twins prove invaluable. It was to be an experience which would test their friendship, and love, to the limit.