Memories of Midnight (Midnight #2) by Sidney Sheldon

In THE OTHER SIDE OF MIDNIGHT, they played the ultimate game of love, lust, and death.

Now, in MEMORIES OF MIDNIGHT, the survivors meet to play one last time...

Shadowed by tragedy and burdened by amnesia, a beautiful woman desperately tries to return to reality. She is Catherine Douglas, destined to once again challenge the cruel, charismatic power of Constantin Demiris, the Greek shipping tycoon who murdered Catherine's husband. Now, in the glittering capitals and carefree playgrounds of post-war Europe, Demiris sets his deadly sights on Catherine -- and the single, treacherous secret whose shattering truth is known to her alone...