Books 26 and 27,
Redemption Point and Gone By Midnight, both by Candice Fox.

Set in hot humid crocodile country, there's two unusual private detectives, both outcasts.
One was falsely accused as a paedophile, but mud still sticks. The other was convicted of murder as a teenager.

I got both books from the library and devoured them.

Good series. Recommended Aussie Noir.

@Cbooks
From the description, it sounds like the plot of the ABC series, 'Gone troppo'. I didn't realise it was based on a book series.
@gwendolenau Yes, Troppo was based on Crimson Lake, although with a slightly different family at the centre of the murder. These are the next two in the series.