Solution for Angel of Terror"

A) Etc
B) Dido Queen of Carthage
C) Gabriel Setup
D) Arms and the Man
E) Reiterate
F) When the Gangs Came to London
G) Adventure of the Christmas Pudding
H) Let he who is without sin (Sorry, not my grammatical mistake!)
I) Lady Windermere's Fan
J) Acidic
K) Crystal Star
L) Emit
M) The simpleton of the unexpected Isles
N) How he lied to her husband
O) EC
P)A mast
Q) nighttime
R) G
S) echo
T) Lucius Shepard
U( Omit
V) Further
W) Turgid
X) Exertion
Y) Rim
Z) RC
[) ohm
\)  rimy

And the first letters read: Edgar Wallace, The Angel of Mercy

It was a curious fact that while her father made the most guarded references to all their exploits, and clothed them with garments of euphemism, his daughter never attempted any such disguise. The psychologist would find in Mr Briggerlands the embryo of a once dominant rectitude no trace of which remained in his daughter's moral equipment.