"Logic bows at the throne of obsession."

When Wren discovers a body and Castien in the tunnels on the same night, she's certain she'll never be able to trust him again. But that doesn't mean she no longer needs him.

In order to discover the killer taking down their fellow students, Wren is forced to rely on Castien's strategic mind and his knowledge of the Obsidian Order.

Wren wants nothing more than a cordial alliance, but Castien is intent on winning much more than her loyalty. He longs for her heart.

As they learn to trust each other again, the secret of Wren's stolen journal looms over their fragile happiness like a storm cloud on the horizon.

Will they be able to withstand the tempestuous winds, or will they be ripped apart in the end?

Find out in Tides of Secrets, the epic conclusion of the Obsidian Academy Duet, a love story tinged with obsession and drenched in yearning.