The number of missing

In the months after 9/11 David and Mel meet to drink, give each other comfort and reminisce about Paul -- Mel's husband and David's best friend. The memories are not all good for David. Before Paul died in the north tower, the two friends fought, brutally questioning each other's lives. Fueled by anger and grief and too much alcohol, David stumbles through the city while holding onto a silent promise made to a dead friend: he will wait for Mel to fall so he can catch her.