Left to Envy by Blake Pierce

In the Sistine Chapel, the first tourists of the day look up—and are horrified to find a dead body affixed by ropes to the ceiling.
More victims soon appear, strung up in similarly dramatic fashion on other major attractions throughout Europe.
Who is killing them? Why? Who will be next?
And is FBI Special Agent Adele Sharp—triple agent of the U.S., France and Germany—brilliant enough to enter the serial killer’s mind and stop him before it’s too late?