Twice the speed, twice the trouble, twice the fun, Charlie and Drummond Clark return in Twice a Spy.
Charlie and Drummond Clark are on the lam, hiding out in Switzerland near a clinic which is testing revolutionary treatments for Alzheimer's on Drummond. With them is NSA operative Alice Rutherford, who has been working to exonerate them, but before she can make any headway, she is kidnapped by a terrorist group. To get her back, Charlie and Drummond are forced to plumb Drummond's damaged memory for the location of a secret cache of weapons, then turn over the most lethal of the lot. At the same time, they must find a way to thwart the terrorists before they can use the weapon for unspeakable destruction.
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Short review. This is a good follow up to Once a Spy. A bit more action and a bit less reliance on Drummond (the Dad). If you have not heard of Once a Spy, it is a spy thriller about a super-spy that gets early onset Alzheimer's. His estranged son finds out his boring, appliance salesman is actually a spy. They both end up on the run from both the good guys (who want to take out the father to keep him from spilling secrets) and the bad guys (who want to find the secrets). Great original take on the spy story.
My long review of Twice a Spy on my blog http://bookwi.se/twice-a-spy/
(And the review of Once A Spy just for your info: http://bookwi.se/once-a-spy-by-keith-thomson/