Twenty-six miles. Eighteen years of resentment. One chance to settle the score.

On the morning of the Chicago Marathon, Michael Lewis leaves behind an unopened ring box and another shattered relationship. Ahead of him waits an elite field-and Adrian Dunne, the decorated rival Michael has blamed for eighteen years of lost potential.

Michael has rebuilt his life before. After betrayal destroyed his wedding and sent him spiraling into addiction and despair, running gave him a way forward. With his father's support and two loyal friends beside him, he fought his way back to a future he thought he had lost.

Love has proven harder to navigate. Abby left him questioning everything they shared. Jamie, the longtime friend he once wanted more than anything, offered another chance at happiness. And Stephanie, the trainer who helped him rediscover his strength, has become someone he can count on-even when he struggles to recognize what is between them.

Now, at thirty-nine, Michael has a chance to beat the man whose success has haunted him for nearly half his life. As the miles unfold, memories of love, betrayal, and devastating loss force him to confront the choices that brought him here-and what his pursuit of vindication might cost him.

Winning might settle an old score. But can Michael recognize the love worth holding on to?

Set against the streets of Chicago, Endurance is a contemporary novel about complicated love, enduring friendship, and the courage to begin again.