A Door Near Here, by Heather Quarles, 1998

There's no food in the house, and little money; Mom's passed out drunk and has been for months; the kitchen sink is spewing dirty water all over the kitchen; and Alisa, Katherine's eight-year old sister wants a stamp to mail a letter to C.S. Lewis to ask him where is the nearest door leading to Narnia. Katherine, Tracey, and Douglas have enough to worry about, holding their family together and shielding their situation from teachers who might turn them in to DSS and pull them apart. Exceptional realism grappling with parental abandonment and neglect, and a haunting, lovely tribute to Lewis and his legacy. Strongly recommended.