its actually about Billy Neilson.. SHE is actually a girl.. a nice one that too...
all her relatives have died... the only person she knows is her father's old boy-hood friend.
and so she send this person, who's name is William Henshaw, a letter.. the letter does not explain the fact that Billy is a girl...
now William has 2 brothers - Cyril (who stays almost all day in his room with his music).. and Bertram.( a jolly fellow who paints quite well).
so without knowing that Billy is a girl..
this story is about Billy's adventures in the Stratum. (the house in which William,Cyril and Bertram Henshaw stay at).
its a really really really good book.