Psychic Nan Killian and Medium Sarah Lyon-White - along with their clever birds, the raven Neville and the parrot Grey - have been agents of Lord Alderscroft, the Elemental Fire Master known as the Wizard of London, since leaving school. Now, Lord Alderscroft assigns them another commission: to work with the famous man living at 221 Baker Street but not the one in flat B. They are to assist the man living in flat C. Dr. John Watson and his wife Mary, themselves Elemental Masters of Water and Air, take the occult cases John's more famous friend disdains, and they will need every skill the girls and their birds can muster!