In "Spring of the Sentinels," Ava Mason, a teenager returning to her 1999 hometown of Aurora Bay, stumbles upon an escalating supernatural threat involving a nefarious cult, time travelers, and malevolent extraterrestrials, known as Xenoformers. As she rekindles old friendships and establishes new alliances, including a time-traveler named Hailey and a robot named SCOUT, Ava learns of her unique power sought by the cult to reshape the world. After an unnerving revelation of her future self in a dystopian Aurora Bay and several intense battles, Ava, guided by her friends, navigates multiple timelines and uncovers her destiny as humanity's savior, involving the use of colossal robots known as Sentinels. Engulfed in an impending Xenoformer invasion and betrayed by a friend, Ava must confront her deepest fears and step into her predestined role. The novel is a vivid exploration of courage, friendship, and the intricate dance of destiny as Ava and her companions battle extraterrestrial threats, striving to safeguard their present and future.