There are 4 books in the Nightshade series. The newest book is Snakeroot which came out in 2013.

1
Nightshade

Book cover of Nightshade
She can control her pack, but not her heart ...'I wanted him to kiss me-wished he could smell the desire that I knew was pouring off me. You can't, Calla. This boy isn't the one for you.' Calla Tor has always known her destiny: graduation, marriage and then a life…
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2
Wolfsbane

Book cover of Wolfsbane

You're an alpha, a leader. That's what we need. It's what we've always needed.

When Calla Tor wakes up in the lair of the Searchers, her sworn enemies, she's certain her days are numbered. Then the Searchers make her an offer, one that gives her the chance to destroy her…

3
Bloodrose

Book cover of Bloodrose
Calla has always welcomed war. But now that the final battle is upon her, there's more at stake than fighting. There's saving Ren, even if it incurs Shay's wrath. There's keeping her brother safe, even if he's been branded a traitor. There's proving herself as the pack's alpha and ridding…

4
Snakeroot

Book cover of Snakeroot
The next thrilling novel in the internationally-bestselling Nightshade series! 

Fans asked for it, and now they've got it! Andrea Cremer is continuing the story she began in in her internationally bestselling trilogy: Nightshade, Wolfsbane and Bloodrose. In this new installment, Bosque Mar haunts the dreams of both Adne and Logan,…