Comeuppance

Comeuppance's story revolves around a series of fatal poisonings in varied settings (including a bar, restaurant and sauna) and from a variety of toxins (most of which is swallowed but one of which is air-borne). The targets are triad kingpins and their minions by a single individual whose identity the police and gangsters, not to mention journalists and the public, seek to know but have difficulty determining. (avistaz.com)