Earlier this month, it was announced that Jac Naylor and Henrik Hanssen will take centre stage in on-location scenes in Stockholm, as Jac is sent on a mission to discover exactly what has happened to the hospital's rogue leader.
Rosie Marcel and Guy Henry - who play Jac and Hanssen - worked on the storyline earlier this year, and our gallery below takes a look at the filming and some of the locations used.
As confirmed last week, the plot begins when Jac is told that Hanssen is in his native Stockholm and is blocking a financial offer from a Swedish pharmaceutical company that would pump £40 million into Holby.
Jac is instructed to track down Hanssen and find out why he is sabotaging such a lucrative opportunity for the hospital.
A Holby City statement recently explained: "What follows is a story exploring Hanssen's past, discovering why he has been missing for the past few months, and also looks towards his future and whether he will indeed return to Holby City Hospital."
Holby City airs the episode on Tuesday, January 8 at 8pm on BBC One. Get the Inside Soap magazine on your iPhone or iPad