Fire and vengeance
(Book)

"Never has Koa's motivation been greater than when he learns that an elementary school was placed atop a volcanic vent, which has now exploded. The subsequent murders of the school's contractor and architect only add urgency to his search for the truth. As Koa's investigation heats up, his brother collapses in jail from a previously undiagnosed brain tumor. Using his connections, Koa devises a risky plan to win his brother's freedom. As Koa gradually unravels the obscure connections between multiple suspects, he uncovers a 40 year-old conspiracy. When he is about to apprehend the perpetrators, his investigation suddenly becomes entwined with his brother's future, forcing Koa to choose between justice for the victims and his brother's freedom." -- goodreads.com

Torrential rains from Hurricane Ida pour into volcanic faults, and the resulting steam explodes-- destroying an elementary school, killing and injuring students and staff. When the school's contractor and architect are subsequently murdered, the question arises: was the school placed on the fault on purpose? As Koa searches for the truth, his brother collapses in jail from a previously undiagnosed brain tumor. Gradually unraveling the obscure connections between multiple suspects, Koa uncovers a 40 year-old conspiracy. But when his investigation becomes entwined with his brother's future, Koa must choose between justice for the victims and his brother's freedom. -- adapted from jacket and Chapter One.