Sarah Campbell told one tiny white lie.

When her tech-giant employer moves her to a cottage on a small Scottish island to work on a classified, controversial, and potentially world-saving project, Sarah must keep her eco-terrorist mother in the dark to prevent her from disrupting everything. Sarah's cover story—she's fallen in love, she and her girlfriend are escaping the bustle of the city, she couldn't be happier... But Sarah's better at firewalls than real walls, and when she arrives at the run-down cottage, she quickly discovers she needs help.

Pippa Kent is a widowed, semi-retired structural engineer who's done with love. She fills all her free time running a handywoman service on the island. When Sarah calls Pippa out for the most basic repairs, Pippa can't help but wonder—often out loud—how anyone could be so inept at home maintenance.

Then Sarah's mother suddenly decides to visit and meet her daughter's wonderful new partner. With little option, Sarah begs Pippa to be her fake girlfriend. Only the more time they spend faking it, the less pretend it feels.