 When one of the patients at an upscale treatment center dies in a fire, Mayo and his team swing into action. The dead man was a drug addict being treated and mentored by a smarmy administrator, who may have convinced the man to leave the center his trust fund of millions of pounds. Mayo is joined in the case by Alex Jones, with whom he "has a past." The first thing the team must discover is whether the death was murder or a suicide made to like like one. But then a second death, this time obviously a murder, muddies the waters.