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A woman mysteriously disappears from a yacht, during a trip with her boyfriend and friends. Dr. Goldberg tries to convince Professor Tempest to resume collaboration with the police.

While Jasper visits a home for the elderly, a woman is killed by one of the people living there. But there may be more to the murder than meets the eye.

A school inspector is killed, first by five stab wounds, and then by being smothered. Why two different methods?

A stage prop knife is substituted by a real knife. Who did the switch and why?

When a painting is destroyed, suspicions fall on a group of climate activists. But the next attack leaves a dead body behind.

A man staggers in front of a car, and confesses to killing a man before dying. But where is the body?