Guest Stars Hannah Arterton as DC Ally Caine Geraldine James as Julie Wells Michael Maloney as Alan Wells Rade Serbedzija as Jakob Marosi Sophia La Porta as Britnay Shearer Lee Boardman as Jay Newman Barnaby Kay as DI Liam Townsend Tom Price as Kenton Marshall Honeysuckle Weeks as Laura Marshall Lauren Douglin as Izzy Allan Syrus Lowe as Larry Kim Allen as Jane Shilling Saoirse-Monica Jackson as Sasha Dylan Jupp as Simon Marshall Seeta Indrani as Dr. Khan James Boyland as DS Cal Brown Simon Ludders as Joe Hanley