I talked to Janne Friday morning instead of Thursday evening. Turns out he was at an end-of-season dinner on Nämdö with a whole bunch of his fellow island builders. He and Lennart boated home around 10 PM.
The next morning, Janne's phone started ringing. There had been an accident north of Nämdö, not far from the southern tip of Aspö, around 1AM. A good-sized boat had run aground at high speed. Two men were killed, and two injured. Although the names of those involved have not been released, Janne fears one of the men was his tablemate from the dinner.
A sobering reminder of the perils of the sea. A news story in English is here.