"The Lark is a novel for grown-up children. It has many of the ingredients of E. Nesbit's children's fiction, starting with a magic spell, and moving on to secret doors, missing keys, dressing up, trespassing in shut-up houses, imprisonment, good-hearted burglars, small but dramatic injuries, mistaken identities, extraordinary coincidences, boats, trains, pet rabbits, cocoa, and small squabbles about nothing in particular. And it is bursting with the same energy, humour and sense of discovery that made Nesbit one of the best-selling children's authors of the early twentieth century. As in The Wouldbegoods, The House of Arden, Five Children and It, and The Railway Children, she revels in the power of fiction to make things turn out all right."
Charlotte Moore, from her introduction to E. Nesbit's The Lark, my current reading.