Give Me One Summer by Emilie Loring

Beautiful, impetuous, Melissa Barclay had grown up in an atmosphere of security and ease.

But now, suddenly, that life was gone, and she finds herself totally alone. Whom could she turn to? Whom could she trust? Johnny Grant, the wealthy playboy she’s known since childhood? Or Lex Carson, the mysterious, handsome stranger who asked for her love, yet remains so strangely distant?
At first Lissa thought that she had the whole summer to decide. But then, amid feverishly mounting intrigue and danger, she will have to make the right choice soon – or else lose her chances of happiness forever.