Nicola Walker (DCI Cassie Stuart), Adeel Akhtar (Hassan Mahmoud) and Josef Altin (Tyler) previously starred together in River (2015), as Jackie 'Stevie' Stevenson, Ira King and Christopher Riley respectively.
Mark Bonnar (Colin Osborne) & Jordan Long (DS Murray Boulting) also worked together on New Blood (2016) as Peter Mayhew & Jerry Clarke respectively.
Mark Bonnar (Colin Osborne) & Adeel Akhtar (Hassan Mahmoud) also worked together on Apple Tree Yard (2017) as Gary Carmichael & Jaspreet respectively.