James Patterson: Violets are Blue

The story starts where the Roses are Red ended, basically, with the death of Betsy, an FBI agent that Alex had worked with in the Mastermind case. Then he goes into another case that reminds him of a murder that happened about five years before.

But he's still got the Mastermind to deal with, the man keeps calling him, and it's like he knows exactly where Alex is, and what he's doing... and maybe he does... You'll have to finish reading this one to know the complete end...