Twilight at Tikal

A call for help on a missing person case brings the Paul Zacher Agency down to the untamed jungles of Guatemala. Is it a kidnapping? And what is the true story behind a missing jade burial mask? Because even among the pyramids of the ancient tropical Mayan city of Tikal, nothing is as it seems. Who is more dangerous, old friends or new enemies in this, the 18th book in the Paul Zacher Detective Agency mystery series?