Please summarize "The Cellist of Sarajevo" by Steven Galloway.

Steven Galloway's novel, The Cellist of
Sarajevo, in based on the lives of two "real" people living in Sarajevo
(Bosnia), while the other two characters are fictional. The first character is the
cellist. He is playing "Albinoni's Adagio" on the street one day, and nearby there is a
group of about twenty people in line to buy bread. In the twinkling of an eye, a mortar
shell drops in this part of town and though the cellist survives, all of those waiting
for bread have been killed. The following day, standing in the same crater of
destruction, the cellist begins to play and continues for twenty-two days: one day for
each person lost. (This war will last four years.)

Another
major character (based upon a woman living in Sarajevo at this time) is known as Arrow.
(This is not her real name: she hopes to be able to put her present-day identity behind
her someday after the war is over.) She is a sniper, but unlike the soldiers who kill
indiscriminately, she kills only soldiers—those who take the lives
of unarmed citizens. Ultimately, she will be asked to protect the life of the
cellist.

The third [fictional] character is the baker,
Dragan. While he still works and lives in the city, his family (wife and son) do not.
(He survives by trading bread for shelter.) He is afraid to go to work each day for fear
that a sniper will end his life. He lives in a world of his own making: among memories
of the way life used to be—the way this town that he loves was
before the war.

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Every day the Sarajevo he thinks he remembers
slips away from him a little at a time, like water cupped in the palms of his hands, and
when it’s gone he wonders what will be left. He isn’t sure what it will be like to live
without remembering how life used to be, what it was like to live in a beautiful
city.

He hopes that someday
that time and that town will return.

The final character,
also fictionaly, is Kenan who travels abroad to find drinking water for his family and
his neighbor. While the work is not easy, he cannot ask any other family members to go
with him because of the danger to them, and he worries about who would care for them if
he were killed.

The lives of these four people are
interwoven in the midst of fighting and death that has fallen on Sarajevo. Survival is
one theme, but maintaining hope when all else seems lost is what these four do. The
reader is presented not only with the story of fighting, but the spirit of those living
with it everyday. It speaks to the desire of people to rise above the hopelessness and
death around them. Our characters don't want to lose their identity, even as the city
seems to lose its identity. Though tired of war and all that comes
with it, they don't give up. This is a story of  a few occupants of Sarajevo who have
been called to "arms" in the face of attack, who try—even as they become strangers
compared to who they were before—to hold on to their own humanity, as well as the their
morals and values.