Guest Stars Gary Mavers as DI Will Manning Peter Watts as Iain Garrick Colin Spaull as Joe Crake Ben Turner as Davie Pickering Kate Miles as DI Nikki Acott Oliver Dimsdale as Michael Mallins Francesca Ryan as Marie Crake Reuben-Henry Biggs as Niall Crake Cicely Tennant as Sophie Mallins Keith Bartlett as Adam Mallins