The last hope

A secret spy die but before he dies sends a messenger to his son to tell him to save America it has been 3 years now he was only a pitiful boy and is now a brave man who will do any thing for his family and his girl friend Erica

PS: this is not proof read so if some thing is out of order or miss spelled pls forgive me

PPS:look for numbers there will be a secret message at the end the numbers will tell you who did it

Cheat sheet:
1=a
2=b
3=c
4=d
5=e
6=f
7=g
8=h
9=i
10=j
11=k
12=l
13=m
14=n
15=o
16=p
17=q
18=r
19=s
20=t
21=u
22=v
23=w
24=x
25=y
26=z