This was the continuation of Charlotte Allen's "Parting Gifts" and as wonderful a novel as any other of her's I've read.

From back cover:

"After years of self-imposed reclusiveness, Lucinda Hunter has started moving out into the world. She has found her family and her isolation has ended, largely thanks to Katanya Taylor, who ventured into her garden five years earlier and beckoned to Lucinda to come outside. Now a feisty, somewhat irreverent teenager, Katanya comes with her mother and grandmother to spend weekends with Lucinda-their inital connection stronger than ever.

Everything is going well. Yet Lucinda fears she will never have sufficient time to spend with her very elderly grandmother; that she will never be able to absorb all the details of the family history. She is racing against time. She is happier, though, than she's been since childhood. And meeting Eli Carter, her grandmother's doctor, presents an unexpected and challenging set of new circumstances.

Then, on September 11, 2001, the world is cataclysmically changed. In the aftermath, faced with the shattering repercussions that affect everyone and everything Lucinda knows, she is pulled, finally, entirely, into a new reality."

On loan to Heidi.