A Christmas odyssey - Anne Perry

It is 1865 and in Victorian London the city is preparing for Christmas, with its feasting and celebrations, yet James Wentworth's mind is focussed only on the disappearance of his wayward son, Lucien.
He turns to his old friend, Sir Henry Rathbone, for help.
So begins an investigation led by Sir Henry, assisted by the reformed criminal Squeaky Robinson and the enigmatic Doctor Crow.
They are led, ever deeper, into the seedy underbelly of the capital, a squalid world, where the trail leads them closer to Lucien.
But with tales of Lucien's violent tendencies, an obsession with a dangerous young woman and the disturbing Shadow Man, can they bring Lucien home alive?
Or will this be a grave mistake for all concerned?