Red Equinox

A very good read. Ryan and his group end up near Moscow in an old American embassy. However, the gateway is damaged, and they require some tools which they don't have to return to the Deathlands. Ryan, Kristy, and a character introduced in the previous novel go to Moscow in the hopes of finding the necessary equipment to fix the gate. Their presence is noticed by the same Russian Commander and his tracker introduced in the second novel, and its a race against time and the enemy to return to the gate, and get out of Russia, where the hatred of Americans burns brighter than ever...