Si McKirdie is the enigmatic, menacing kingpin at the top of Glasgow's criminal underworld... but even he has a boss. And when that boss arrives in Sinkhill, seeking answers for Si's perceived poor recent performance, it doesn't bode well. Especially when Si also has to deal with a highly valuable artefact gone missing, ambitious competitors eyeing up his turf, a betrayed friend he needs to make amends with, and a lost cat. A tough day at the office, especially when you're trying to keep the body-count to a minimum...