The Lighthouse Family #4 The Turtle by Cynthia Rylant illustrated by Preston McDaniels*

In a dense fog, Seabold, Whistler and Lila hear a cry for help.  As they descend down the slippery rocks, a sea turtle.  A gale has blown him off course and he now cannot swim in the wintry sea.  With Pandora's problem-solving skills, the family figures out a way to return him to the warm seas.
*Highly recommend.
*Borrowed from the library.
Guided Reading Level: O-P (3rd grade)