The detective thinks she is the killer of six people.

The detective had X under control again, or thought he did.

As he sat down to dinner at a table just inside the dining-room door, the detective was thinking hard.

Both detectives were thinking she'd come to see her spiritual director on the day before she was killed.

The detective thought the man appeared suspicious and followed him.

The detectives think he must have had a key that opened the little side door.

The detectives think a third person might have been at the scene.

Both detectives thought he could have passed for much younger than that, even a middle school student.

The private detective was thinking about something quite different.

I had no idea what the detective was thinking as she regarded me.