Stellar Assignment by E.C. Tubb

Trapped in an economic rat-race, Kevin Blake had little going for him but an over-active imagination—an attribute which brought him to the notice of Paul Trevainen. Trevainen made Kevin an offer he couldn’t resist: find a billionaire’s daughter, bring her back to Earth, and collect a dazzling reward.

The only trouble? Crystal was wilful, stubborn, and worst of all, hard to find.

The quest would force Kevin to become an advocate in an alien court, turn him into a hunter, and make him the captive of giant, money-hungry frogs. Worst yet, he would have to rebel against established authority, become a fugitive, and even a criminal.

Was it a mistake to long for adventure?