Wash This Blood Clean From My Hand (French: Sous les vents de Neptune, lit.

"Under Neptune's Winds") is a crime novel by French author Fred Vargas, originally published in France in 2004.

That killer's modus operandi involves having a bystander being wrongly accused, which happened to Adamsberg's own brother, and some weapon with three blades, some sort of a trident, hence the Neptune reference.

Female officer Retancourt, the most capable of his subordinates, understands he has been set up, and manages to sneak him back to France.

But the Trident, who is a formidable man, threatens Adamsberg with commanding the death of his child and the latter's mother, if he does not confess to the Canadian murder and commit suicide.