Filming has begun in and around London on a four feature-length episodes in which the duo explore murky crimes such as the tragic death of a 2000s poster, the impenetrable world of the U.S. Embassy, the splendor of Kew Gardens, a classic music academy and a climate scientist found dead in a supercar. Also new is Max embarking on couples therapy with his estranged wife Astrid (Anamaria Marinca) and Layla getting used to living in London as her partner, Jon, resides in Exeter.