Gravity's Rainbow by Robert Harris

[Erik T. Burns]

*The first rocket will take five minutes to hit London.You have six minutes
to stop the second.From the best-selling author of Fatherland and Munich
comes a WWII thriller about a German rocket engineer, a former actress
turned British spy, and the Nazi rocket program.*

It’s November 1944–Willi Graf, a German rocket engineer, is launching Nazi
Germany’s V2 rockets at London from Occupied Holland. Kay Connolly, once an
actress, now a young English Intelligence officer, ships out for Belgium to
locate the launch sites and neutralize the threat. But when rumors of a
defector circulate through the German ranks, Graf becomes a suspect.
Unknown to each other, Graf and Connolly find themselves on opposite sides
in the hunt for the saboteur.

Their twin stories play out against the background of the German missile
campaign, one of the most epic and modern but least explored episodes of
the Second World War. Their destinies are on a collision course.

https://www.penguinrandomhouse.com/books/607955/v2-by-robert-harris/