Megan Atwood 
Bridge of Death [PDF ebook] 

"Believe me, I don’t like this any more than you do, but you’re the only one who has the expertise and equipment. There’s something going on at St. John’s Bridge, and I want to hire you to find out what it is."After a shakeup in the Paranormalists’ operation, the two ex-best friends are on the outs, and at the worst possible time. Because a deadly supernatural threat is putting their classmates in harm’s way . . .