puzzle out

At the beginning, Dr. Watson tries to puzzle out the profession of his strange roommate at 221b Baker Street.

More than ever did I set my brain to puzzle out some way of escaping this horrible infliction.

As he went down the mountain he tried to puzzle out the why and wherefore of Dancing Town.

With a shout, the two boys were off, leaving the other Cubs to puzzle out their various clues.

She feared, however, to give him his entire freedom; so she set to work to puzzle out a scheme that would solve the problem.

He left the room, and Cleek sat alone, trying to puzzle out the whole awful affair.