A British agent mysteriously murdered on Lake Konstanz in Germany. Keith Martel, his replacement, must move swiftly.

Aided by Claire Hofer.

The neo-Nazi DELTA organization are conspiring ruthlessly.

Someone else is conspiring equally savagely. Double Jeopardy.

A nightmare bloodbath in Zurich. A sudden attempt on Martel's life. And close to midnight on 2nd June, the Summit Express moves east, taking the top four Western leaders to meet their Soviet counterpart in Vienna.