The Hat, The Umbrella and the Little White Gloves

Clarissa, Claudia, Chloe, Alexander, Clod and baby Antoine live in an old house in Paris. They are cared for (and I use the term loosely) by Nanny Floss as their Mother rarely leaves her room.But there is magic in this book. Magic that lives in the strange black hat that appears on the doorstep; and in the umbrella that arrives soon after, followed by a pair of small white gloves that are capable of all sorts of mischief.Is it possible to get rid of a magic hat? Especially if it has arrived on your doorstep for a reason and doesn't want to leave! And what did the evil magician Marvello do that was so terrible? The solution to the puzzle may be found at the theatre where their Mother performed on stage; before it all went horribly wrong...