Double Diamond Triangle Saga Books in Order

The Double Diamond Triangle Saga is a shared-world serial, which means it works a little differently from a normal trilogy. Several authors each handle part of the larger story, and the books lock together around one central object, a priceless diamond, and the greed, betrayal, and pursuit that follow it.

That structure gives the series a quick, rotating energy. Each installment shifts the angle a bit, but the larger chase keeps moving. You are not reading one hero's steady arc so much as watching a web tighten around the same prize. That makes the line feel closer to a caper or a mosaic than a single straight quest.

Greenwood's entries, The Mercenaries and The Diamond, sit inside that larger machine. They bring in his usual taste for sharp talk, dangerous employers, and trouble that spreads faster than the people involved first realize. Even in a collaborative setup, he is good at making the world feel crowded with motives.

The treasure is only half the point.

If you enjoy linked fantasy novellas and do not mind a series that hands the baton from writer to writer, this one is worth a look. It is best read as part of the broader sequence, because the fun comes from seeing how each piece changes the shape of the chase.