In typical Investigation Discovery fashion, "Mansions & Murders" incorporates stylized re-enactments complete with first-person perspective from the main players of criminal investigations. The docuseries sheds light on sordid drama that unfolds inside extravagant estates, where hired help go from unassuming to unstoppable and steal the show. Whether it's a nanny uncovering clues to a murderous marital spat or a private nurse giving everything to protect her wheelchair-bound boss, the usually peripheral personnel turn detective, defender, and star witness when faced with deadly dealings that no amount of millions can conceal.