The Italian yard Otam will unveil the fourth model in its Millennium line, the 80 HT Mystere, at the Sept. 12-17 Cannes Yachting Festival.

The 83-foot yacht is the fourth in the Millennium series and the biggest difference between the new model and her predecessor is that Mystere has twin engines instead of the quadruple configuration that was in the boat introduced at Cannes in 2015.

Reducing the number of engines allowed designers to create a more spacious interior, including a full-width owner’s suite, with his and hers private heads. A design highlight of these staterooms is the lack of stairs, which facilitates moving from one area to another.

There’s a separate VIP cabin, galley and dedicated access to the crew quarters in the bow.

The new model is equipped with twin 2,600-hp MTU M94 engines with Arneson surface drives, and the propulsion system reportedly reached speeds of more than 55 mph in sea trials. Cruising speed is estimated at 47 mph.