Zac and Leah's marriage is in trouble when Zac forsakes their vows. Tori grapples with Riley's cheating past. Matt is pressured to leave the Bay when Evie gets an amazing opportunity.

Marilyn is heartbroken to find out John is the arsonist... but so is John.

Ash finds out John is the arsonist and he wants answers.

Zac forsakes his vows, and cheats on Leah.

Summer Bay mourns and remembers Billie at her funeral service as a stranger watches from afar.

Billie's nearest and dearest come together for a very special send-off. John and Marilyn are devastated as the truth of the Summer Bay firebug explodes.