Summer Island by Kristin Hannah

Thirty-four year old Ruby Bridge is a not-too-successful comedienne who uses her mother, a nationally-syndicated "moral and spiritual counselor" as the main fodder for her cynical, rather bitter humor. Her mother Nora, long divorced from Ruby's father, is a woman whose past is just about to catch up with her—in the form of blackmail by a former lover.

After an accident (an attempted suicide?) Ruby returns to care for her stricken mother—bitterly resenting the fact that once again her mother's life has colonized hers. When she is approached by a publisher to write a biography of her mother, Ruby is desperate for the princely sum offered. Yet her research into her mother's past reveals a woman very different from the one Ruby expected. And what began as "mommy dearest" ends as a love story—not only between mother and daughter, but involving two very different men who play a key role in linking the past to the present.