What are some good challenging books..?

I'll tell you what the series is and then put the books in order. =)

The immortal series by Alyson Noel:

Evermore

Blue Moon

Shadowland

Dark Flame

Night Star

Everlasting

The touch series by Laurie Faria Stolarz:

Deadly Little Secret

Deadly Little Lies

Deadly Little Games

Deadly Little Voices (it comes out this november!)

Percy Jackson and the Olympians series by Rick Riordan:

The Lightning Thief

The Sea of Monsters

The Titan's Curse

The Battle of the Labyrinth

The Last Olympian

The Heroes of Olympus series by Rick Riordan (same characters from percy jackson series but you have to read the percy Jackson series first to understand it)

The Lost Hero

The Son of Neptune (comes out this fall)

The Riley Bloom Series by Alyson Noel

Radiance

Shimmer

Dreamland (comes out this fall)

Whisper (comes out spring 2012)

The House of Night series by P.C. + Kristin Cast

Marked

Betrayed

Chosen

Untamed

Hunted

Tempted

Burned

Awakened

Destined (comes out this fall)

The Kane Chronicles series by Rick Riordan:

The Red Pyramid

The Throne of Fire

The Wolves of Mercy Falls series by Maggie Stiefvader:

Shiver

Linger

Forever (comes out this summer!)

these books are AMAZING!

Stories by Edgar Allen Poe

Their very challenging and he

he uses big vocabulary example of one of his story To tell, tell heart