Helen Clapp's breakthrough work on five-dimensional spacetime landed her a tenured professorship at MIT; her popular books explain physics in plain terms. Helen disdains notions of the supernatural in favor of rational thought and proven ideas. So it's perhaps especially vexing for her when, on an otherwise unremarkable Wednesday in June, she gets a phone call from a friend who has just died. That friend was Charlotte Boyce, Helen's roommate at Harvard....

"In WWII Denmark, Baron Henrik Ahlefeldt assumes the identity of a common shipyard worker, rowing messages to Sweden for the Resistance. His life depends on keeping his secret hidden-a task that proves challenging when he meets Else Jensen, an American physicist who seems to see right through him"--

"Berlin. 1963. The height of the Cold War. An early morning spy swap, not at the familiar setting for such exchanges, or at Checkpoint Charlie, where international visitors cross into the East, but at a more discreet border crossing, usually reserved for East German VIPs. The Communists are trading two American students caught helping people to escape over the wall and a lower level CIA operative. On the other side of the trade: Martin Keller, a physicist...

"A disgraced ex-CIA operative must return to the field with only his ex-wife as his handler in this electrifying thriller from a former intelligence officer. A single well-placed American asset has kept Iran's secret uranium enrichment from hitting weapons-grade. For the last decade, a mild-mannered Iranian physicist has enabled a CIA hack into software controlling Iran's gas-centrifuge arrays. But now the saboteur has gone dark, off grid-and he's...

The compelling story of a couple living in the wake of a personal tragedy. She is a star employee of an online dating company, while he is a physicist, performing experiments that, if ever successful, may have unintended consequences, altering the nature of their lives and perhaps of reality itself. Rebecca Wright has gotten her life back, finding her way out of grief and depression following a personal tragedy years ago. She spends her days working...