Slater: Modern-day, Medieval-alternate-world (Hengist-People of the Horse Book 4)

Slater is the son of Mason, but he will never be a chip off the old block. Although his father is responsible for Aveburgh henge, Slater is more interested in learning about the ceremonies held amongst the stones.

Torn from a solstice celebration into a real-life nightmare, Slater's talent for reading ley lines upsets dark forces.
Ancient magic pulls him back in time to reveal his connection to primeval secrets. There, he is teased by formidable priestesses who teach him the power of earth energies. Slater’s ability to solve problems under pressure is his strongest weapon against terrifying shamen who want only one thing from him – his death.

Only Slater knows the prehistoric temples are not built correctly, but what will happen if he interferes in the past?