Blanchet, T: Herrick's Key

Be careful what you witch for...
Ollie is back on the Brickside, and he's living on borrowed time.
He thought his mission was simple: Follow the clues and find the key. Fast.
But when the "clues" are enigmas written in blood and the "key" has been split into pieces and scattered around Boston, it doesn't take long for that mission to crumble like a North End cookie.
The trail leads Ollie deep into the underbelly of the city's most recognizable landmarks and beyond-all the way back to the place where the trouble began. Herrick's home. The place of his sin.
Salem.
The answers are out there, somewhere. And Ollie intends to find them. But first, it seems, he'll have to decipher codes, infiltrate the world's most unlikely coven, survive brutal betrayals, see the unseen, solve riddles, commune with turtles, walk with ghosts, and maybe even learn to fly, all in an effort to uncover the clouded truths of the past.
Water, earth, air. Three points make one key.
The key, he knows, will open the door.
What he doesn't yet know? Some doors should never be opened.