誰か being used as topic, but without topic particle


Reading Tae Kim's guide, I've seen the phrase:

> 誰が盗んだのか、誰か知りませんか

Where (I think) the term 誰か is being used as topic for the verb 知る.

Is that grammatically correct ?




I don't know 誰か is used as topic but 誰か知りませんか? is common and I think that is
grammatically correct.

It is translated as "Does anyone know ～?" and your sentence is "Does anyone
know who stole?".

