Lynn Austin 
Song of Redemption (Chronicles of the Kings Book #2) 

When King Hezekiah discovers that God’s Law forbids him to take multiple wives, he must choose one woman to love. He must also choose to trust God’s promises when he decides to rebel against his powerful Assyrian overlords. Hezekiah seeks to strengthen his nation’s fortifications by building a tunnel in Jerusalem to hide his water supply. The tension mounts as the Assyrians march closer–and Hezekiah’s tunnel remains incomplete.With his officials advising him to submit to the Assyrians, Hezekiah’s faith is once more severely tested. Chronicles of the King Book 2.