X-Factor Investigations is a detective agency run by Jamie Madrox, also known as Multiple Man. The name is taken from the government-sponsored group the three founders previously served on. The initial staff consists of Madrox's best friend and special enforcer, Guido Carosella (Strong Guy), and former teammate Rahne Sinclair (Wolfsbane). Following the events of the "House of M" storyline, Madrox's new-found wealth from winning a "Who Wants to Be a Millionaire?"-style game show allows him to recruit several of his former colleagues from the Paris branch of the now defunct X-Corporation. New members include M (Monet), a powerless Rictor, Siryn, and Layla Miller, who inserts herself into the group to keep them from discovering the truth behind the "Decimation" storyline.