The whole way home I kept trying to solve the same riddle.

Well, perhaps so; let each solve the riddle as he will.

Time and place they could find out by it solved the riddle, which he had made for them.

What she wasn't getting was any closer to solving the riddle of her past.

The rest stay, until we solve the riddle of the ship that came from nothing.

But at least they helped to solve the remaining riddle.

To solve the riddle of her power she must leap back four days.

Until then the robot would have enough time to solve the riddle.

Within another year, two at the most, he expected to solve the elusive riddle.

We are trying to solve the riddle of this virus, to control it.