Max and Ivan investigate fearsome criminal matriarch Mama Shanks (Katherine Parkinson).
4/4 Richard Wilson stars as the private eyes investigate a sinister-looking retirement home.
3/4 Bridget Christie joins Max and Ivan as they investigate strange goings-on at the circus.
2/4 Jason Watkins stars as an erotic crime author in an investigation into copycat crimes.
1/4 Joanna Lumley guest stars in an investigation into multiple thefts at a community centre.
Mark Heap joins Max and Ivan as their holiday gets too 'human sacrifice-y' for comfort.
4/4 Reece Shearsmith joins Max and Ivan as they investigate ghoulish goings-on in a bookshop.
3/4 Jessica Hynes joins Max and Ivan as they investigate a spate of sporting injuries.
2/4 Matt Lucas joins Max Olesker and Ivan Gonzalez as they investigate a showbiz mystery.
1/4 June Whitfield joins Max Olesker and Ivan Gonzalez to solve a crime at a beauty pageant.