Dive into your creative stream
WAIT
JUST WAIT A DAM SECOND
SO:
1.
In TLT,Percy's mom is murdered (at first he thought she was dead)
In The City of Bones,Clary's mom is kidnapped
2.
In TLT, Percy gets to CHB , his mind about to explode when he learns that greek gods and monsters exist
In The City of Bones, Clary is taken to the Institute and learns that all the myths are real
The plot twists are so similar