The Galapagos Affair: Satan Came to Eden

The wealth of letters and journals, read by a strong cast that includes Diane Kruger and Connie Nielsen, provides an instant emotional charge.

To make a thrilling documentary about the past, you need dead people who were honest or creative in ways you can exploit. This extraordinary film, which deconstructs a murder mystery from the Thirties, has such people in spades.

Quite a few pounds of fat could have been cut from this film, but it's a remarkable tale.

The two-hour documentary provides plenty of background information for a stop on Floreana...