Ripley Under Water has 256 pages.
Ripley Under Ground has 298 pages.
Ripley's Game has 288 pages.
The Boy Who Followed Ripley has 288 pages.
Wonder under Water has 215 pages.
Water Sleeps has 470 pages.
Under the Eagle has 256 pages.
Under Compulsion has 220 pages.
Under Heaven has 567 pages.
Under the Net has 286 pages.
This Is Water has 137 pages.
Under the Green Star has 144 pages.
Under Plum Lake has 136 pages.