The Ancient Future, An Echo in Time & Masters of Reality - Traci Harding,
Stonehenge - Bernard Cornwell,
Whispers in the Sand - Babrara Erskine,
Ice Station - Matthew Reilly,
An Equal Music - Vikram Seth,
Galaieo's Daughter - Dava Sobel.
Try "The Jigsaw Man" and it's follow up "Picking Up the Pieces" by Paul Britton. I finished them both on holiday in less than two days next tot he beach, they are absolutely engrossing.