Two bodies were found near the beach of Lacanau Océan. They are the Gramont twin brothers, well-known surfers in the region. Never seen before at the IML: two rigorously identical bodies, monozygotics! Alex understands that they were poisoned the same evening, an hour apart. But who could blame these two uneventful men, to the point of suppressing them both? Unless the killer has chosen the wrong target, before correcting the situation?