ABANDONED. series of boy searching for clues. supernatural events

[Miguel]

Im looking for a novel series I read two books from when I was a kid. The first book had a book cover with dark artwork. It had a boy in front of an empty cabin-like building and at the back of the book there was a dark shadow of someone. I remember in the book the boy was looking for some sort of clues in which at the end there was an exorcist like scene in which a demon thing manifested itself big time and a priest exorcised it with a piece of wood from the holy cross.
The second book started with a snowy scene in which the boy walked to meet up with someone at a house. In the book there was a scene where the boy and man were trying to decipher a clue in which there was a letter L with vines which resulted in meaning in the term Levine. That's the most I remember now. I hope someone can help me. My head hurts already.

[Courtney]

Maybe the last apprentice series?

[Kris]

Link for Courtney's suggestion - https://www.goodreads.com/series/4172...

[Miguel]

no that wasnt it.

[Miguel]

anyone else?

[Valerie]

What year did you read these books? How old were you? Do you remember the age of the boy? That would help narrow it down.

[Miguel]

Im 21 right now. I was in 4th grade or 5th grade so its old.

[Miguel]

The boy was a teenager maybe

[Lobstergirl, au gratin]

Miguel, are you still looking for this or did you find it?

[Cupcakedoll]

This is very vague but could it have been from John Bellairs' supernatural series?

[Lobstergirl, au gratin]

Lobstergirl wrote: "Miguel, are you still looking for this or did you find it?"

No response in 2 years. Moving to Abandoned.