Keeping Secrets From Readers In Deep Point Of View

How can I keep a secret from the reader? I’m writing mystery, and I can’t let the reader know why my POV character is [insert action: searching, driving to, making a u-turn without explanation, making accusations] because then there won’t be any suspense.

Yes, I’m continuing on the Deep POV FAQ series and this isn’t an actual question from readers but I’ve said: ‘you can’t keep secrets from the reader’ so often I SHOULD be asked about it.

How Deep Point Of View Works

It’s hard to justify a...