Auckland Allies 5: Memorial Museum by Mike Reeves-McMillan.
How far will the Allies go to defend their city?
It’s only a matter of time until the increasingly unhinged Ennead launch another attack. The Auckland Allies want to empower their associates to resist it, but that desire puts them into direct conflict with the misdirected zeal of the Guardians.
A magic-infused Napoleonic sword may hold the key to harnessing the power of the city against their enemies… but only if they can get around the curse laid on it, and find a way to use its sinister power for good.
(This is the final book in the Auckland Allies series.)