The Hodler Connection (Book 31). Genevieve Lenard, #31

A stolen masterpiece. An unwanted gift. A treacherous game. When an unmarked package arrives without explanation, Doctor Genevieve Lenard finds herself drawn into a case the authorities cannot yet see. What appears to be a single, audacious theft is the gateway to a past case, a twisted game, and a scheme far larger than anyone imagined. Genevieve and her elite team must work against a man whose intelligence equals her own, but whose methods do not.
He has spent years building a project the world was never meant to find. Now that the team has discovered it, he will burn down everything - and everyone - to keep it intact. As his control begins to slip, the cost is no longer measured in stolen art. It is measured in the number of people the team is too late to reach. Genevieve must harness her unparalleled skills in nonverbal communication to expose a mind unlike any she has faced.
But how do you stop a man whose paranoia is spiralling out of control - and who has nothing left to lose?