Magic is fading. A deadly power rises. The secrets of the past will determine the fate of a kingdom.

Una seeks to harness her lost magic and prevent the return of a terrifying ancient evil. Stripped of her power and haunted by a past she struggles to understand, she must journey across a war-torn Britannia, seeking the one man who may hold the key to her salvation: Merlin.

But as darkness gathers and enemies plot in the shadows, a shocking betrayal threatens to tear her world apart. A sinister double walks in her likeness, sowing discord, and Una finds herself hunted by friend and foe alike. The ancient Sins of the Otherworld gather strength, and with them, the impending return of Una's father, a deity whose hunger for control could consume all of Britannia.

Can Una reclaim her magic before it's too late? Is the alliance she's forged a match for the darkness to come? And will she truly become the hero Britain needs?

Strength of the Heroes is the fourth book in the spellbinding Arthurian YA fantasy series. If you love tortured heroes, overwhelming odds, and the rise of good vs evil, you will love Jason Hamilton's epic tale.