Season 4 sees DI Max Arnold and DS Layla Walsh return to tackle four new murders within the elite world of Chelsea – a fashion mogul sinking fast in the trappings of her wealth; an aristocratic dynasty guarding their bloodline with brutal devotion; and a wellness and beauty salon owner concealing lethal truths – all falling under the relentless scrutiny of our duo. This season also features a cryptic double-murder that begins in Chelsea and spirals outward, drawing our team into the cut-throat world of architecture. The regular cast return to crack each case and – while a hint of romance is in the air for Max – as ever, the road to justice is anything but smooth.