VERY HIGH STANDARD! A rather useless blurb. As in "sets a," or "fails to live up to," or what? Let's see what Wikipedia says:

Key Out of Time continues the series’ premise, an encounter between Western heroes, and the Russian Communists, and the Baldies, a mysterious alien race that used time travel to alter Earth.

The setting of this novel is a world, Hawaika, appearing to be a tropical paradise.

Dolphins and people can communicate, too.

Kirkus noted it was for young people.