
Bassie and Adriaan have a diamond named after them. Escaped from prison, diamond thieves B1 and B2 attempt to steal it, dressing as Bassie and Adriaan. The actual Bassie and Adriaan are given three days to prove their innocence.

Bas van Toor
Bassie

Aad van Toor
Adriaan
Willem Sibbelee
B1
Harry Dikmans
B2
Frans Kokshoorn
de Boevenbaas

Paul van Gorcum
Diamantair

Dick Rienstra
Inspecteur van der Steen