The Icebreaker
False radio messages on the frozen Gulf of Bothnia.

An icebreaker is clearing the way for a convoy across the frozen Gulf of Bothnia. Someone is sending false radio messages that lead ships off course. On the bridge, in the engine room and in the mess, everyone is listening.
Places
Bridge, engine room, mess, cabins, cargo hold, deck and radio room.
The chapter mystery: The radio messages
The cases of every chapter turn up evidence for the chapter's own mystery.
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