Marian & her sister Laura live a quiet life under their uncles guardianship until Lauras marriage to Sir Percival Glyde. Sir Percival is a man of many secrets
- is one of them connected to the strange appearances of a young woman dressed all in white? & what does his charismatic friend Count Fosco with his pet white mice running in & out of his brightly coloured waistcoat have to do with it all? Marian & the girls drawing master Walter have to turn detective in order to work out what is going on & to protect Laura from a fatal plot...