It's happening again!
Despite their vow to each other at the end of Once Every Never, best
friends Clare and Allie once more find themselves in trouble--and
travelling in time. Indulging in a low-key vacation at Glastonbury Tor,
taking part in an archaeological dig while soaking up the sights of
summertime England, the girls have promised each other: no time travel
shenanigans; no involvement with dangerous Druids or villainous museum
thieves; and definitely no weirdness about the fact that Clare is now
seriously dating Milo, Allie's super-genius hottie cousin!
But when Allie makes an unexpected discovery at the dig site--a
skull--the grisly artifact sends her spiraling back in time to a Roman
encampment besieged by rampaging Celts. Caught between the Legions and
the war band, Allie is rescued from certain death by Marcus, a young
Roman soldier with a secret. As she struggles to survive in the past,
Clare and Milo race desperately against time in the present to bring
Allie home...before she loses her head OR her heart.