The Marriage Test by Suzanne Redfearn

When Ava Barnes’s boyfriend, Justin, proposes after a whirlwind romance, the young couple embarks on a quest that will test their love. For generations, engaged couples in Ava’s family have traveled into the Everglades to retrieve the egg of the magnificent frigate bird in order to bake it into a marriage cake. Those who succeed live happily ever after, while those who fail are destined for heartbreak. With Ava’s beloved grandmother gravely ill, never has the marriage tradition meant so much. Ava’s dream is to pass the test so her grandmother can attend Ava’s holiday wedding to the man she loves.
So Ava, Justin, and their best friend Walton as a witness set off on a remarkable adventure that will challenge the true depth of their character and devotion. An emotional, heartrending journey of self-discovery, The Marriage Test turns out to be far more than any of them imagined.
Is there any test more challenging than a test of love?